Note4Students
From UPSC perspective, the following things are important :
Prelims level: CHAPEA Mission
Mains level: Not Much
NASA is seeking applications for its new mission called the Crew Health and Performance Exploration Analog (CHAPEA), which is related to Mars.
CHAPEA
- The mission is set to begin in 2022 and will give four successful applicants the chance to live and work in a 1,700 square-foot module that is created by a 3D printer and is called the Mars Dune Alpha.
- The simulated quarters include a kitchen, areas for medical, recreation, fitness, work, crop growth, a technical work area and two bathrooms.
- This habitat will simulate what it feels like to carry out missions on Mars including resource limitations, equipment failure, communication delays and any other environmental stressors.
- The crew will be expected to perform simulated spacewalks, scientific research and use virtual reality and robotic controls and exchange communications.
What is the purpose of this mission?
- The habitat in which the crew members will stay will be as Mars-realistic as possible.
- The results from this analog mission will provide scientific data that will help in validating the systems that will be used for actual missions to Mars and also help in solving problems for spaceflight research.
- CHAPEA is not the only analog mission, there are others including Aquarius/NEEMO, Concordia, Desert RATS, and HESTIA.
- Analog missions are required because not all experiments can be carried out in space because resources and money are limited.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Absorption Spectroscopy
Mains level: Not Much
Researchers from IIT Madras and IISER Kolkata have developed a method to detect minute quantities of chemicals in solution using Absorption Spectroscopy.
Note: These days there has been a rise in questions from biology (rather cell biology in particular).
Absorption Spectroscopy
- Absorption spectroscopy is a tool to detect the presence of elements in a medium.
- Light is shone on the sample, and after it passes through the sample is examined using a spectroscope.
- Dark lines are seen in the observed spectrum of the light passed through the substance, which correspond to the wavelengths of light absorbed by the intervening substance and are characteristic of the elements present in it.
- In usual methods, about a cubic centimeter of the sample is needed to do this experiment.
- In the method developed here, minute amounts of dissolved substances can be detected easily.
- Usually in absorption spectroscopy, the principle used is that light because of its wavelike nature, shows diffraction patterns, that is, dark and light fringes, when it scatters off any object.
Studying small objects
- A related concept called the Abbe criterion sets a natural limit on the size of the object being studied.
- According to this criterion, the size of the observed object has to be at least of the order of the wavelength of the light being shone on it.
- If one wants to perform absorption spectroscopy using visible light, namely, blue, green and red, the wavelengths [of these colours] are about 400 nm, 500 nm and 600 nm, respectively.
What has Indian researchers achieved?
- In the method used by the researchers here, tiny, nano-sized particles that can absorb light being shone on them and re-emit red, blue and green light were employed.
- The particles emit electric fields that are analogous to how a tiny magnet would give off magnetic lines of force – this is called a dipole, and the particle is like a tiny mobile phone’s antenna.
- This dipole generates an electromagnetic field depending upon the quantum properties of the erbium dopants in the glass.
- The absorption leaves a gap in the reflected light, which is what is observed and used to analyse the nature of the absorbing material.
Applications of this technology
- There are many potential applications.
- Small molecules almost ten-millionth of an mm in diameter can be detected while these pass the emission region of the glass particle.
- The future is to use it to measure individual molecules, see absorption spectroscopy of a single DNA or protein molecule.
Try this
Q.Which of the following statements are correct regarding the general difference between plant and animal cells?
- Plant cells have cellulose cell walls whilst animal cells do not.
- Plant cells do not have plasma membranes unlike animal cells which do.
- Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles.
Select the correct answer using the code given below:
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Answer this PYQ here:
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Retractable Roof Polyhouse
Mains level: Not Much
The CSIR-CMERI has recently inaugurated a “naturally ventilated polyhouse facility” and laid the foundation stone of “retractable roof polyhouse”.
What is a Polyhouse?
- A polyhouse is a specially constructed structure like a building where specialized polythene sheet is used as a covering material under which crops can be grown in partially or fully controlled climatic conditions.
- It is covered with a transparent material as to permit the entry of natural light. Polyhouses are also helpful in reducing threats such as extreme heat and pest attacks in crops.
- This is especially important for crops growing in the open field with no protection from the weather, and therefore its yield, quality, and crop maturity timings are changed.
Retractable Roof Polyhouse
- The retractable roof system is a modular screen system for greenhouses that helps in saving costs and time along with providing stability, flexibility & durability for the greenhouse structure.
- Such polyhouse will have an automatic retractable roof which will be operated based on weather conditions and crop requirements from the conditional database using the software.
Advantages offered
- Ability to use the benefits of natural weather conditions
- Long life of the system and material used
- Easy assembly and installation
- Maximum insulation and complete protection from insecticides
- Easy maintenance & even easier repair work during operation
Why need such polyhouse?
- With rapidly rising temperatures due to mounting greenhouse gases in the atmosphere from human activities, crops are increasingly facing both threats — extreme heat and pest attacks — simultaneously.
- Crop losses in India due to insect pests are about 15 percent at present and this loss may increase as climate change lowers the plant defense system against insects and pests.
- Conventional greenhouses have a stationary roof to reduce the effect of weather anomalies and pests.
- However, there are still disadvantages due to roof covering which sometimes lead to excessive heat and insufficient light (early morning).
- Besides this, they are also prone to insufficient levels of carbon dioxide, transpiration, and water stress.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Abanindranath Tagore
Mains level: Not Much
Year-long celebrations marking 150 years of Abanindranath Tagore have been kicked off in Kolkata.
Abanindranath Tagore (1871-1951)
- Tagore CIE was the principal artist and creator of the “Indian Society of Oriental Art”.
- A nephew of Rabindranath Tagore and a decade younger to the poet, he helped shape modern Indian art and was the creator of the iconic ‘Bharat Mata’ painting.
- He was also the first major exponent of Swadeshi values in Indian art, thereby finding the influential Bengal school of art, which led to the development of modern Indian painting.
- He was also a noted writer, particularly for children.
- Tagore sought to modernize Mughal, Rajput styles to counter the influence of Western models of art, as taught in art schools under the British Raj.
- Along with other artists from the Bengal school of art, Tagore advocated in favor of a nationalistic Indian art derived from Indian art history, drawing inspiration from the Ajanta Caves.
Q. Which among the following event happened earliest? (CSP 2018)
(a) Swami Dayanand established Arya Samaj.
(b) Dinabandhu Mitra wrote Neeldarpan.
(c) Bankim Chandra Chattopadhyay wrote Anandmath.
(d) Satyendranath Tagore became the first India to succeed in the Indian Civil Services Examination.
Answer this PYQ in the comment box:
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: INS Vikrant
Mains level: Indigenization of defense production
The much-awaited sea trials of India’s maiden indigenous aircraft carrier (IAC-1), built by the public sector Cochin Shipyard Ltd (CSL) have begun.
Indigenous Aircraft Carrier 1
- IAC is the first aircraft carrier designed and built in India.
- It has been designed by the Indian Navy’s Directorate of Naval Design (DND), and is being built at Cochin Shipyard Limited (CSL), a public sector shipyard under the Ministry of Shipping.
- The IAC-1, the biggest warship made indigenously, has an overall length of 263 m and a breadth of 63 m.
- It is capable of carrying 30 assorted aircraft including combat jets and helicopters.
- Propelled by four gas turbines, it can attain a top speed of 30 knots (about 55 kmph).
- The vessel will have a complement of 1,500 personnel.
Significance of IAC 1
- An aircraft carrier is one of the most potent marine assets for a nation, which enhances a Navy’s capability to travel far from its home shores to carry out air domination operations.
- Many experts consider having an aircraft carrier as essential to be considered a ‘blue water’ navy — one that has the capacity to project a nation’s strength and power across the high seas.
- An aircraft carrier generally leads as the capital ship of a carrier strike/battle group.
- As the carrier is a valuable and sometimes vulnerable target, it is usually escorted in the group by destroyers, missile cruisers, frigates, submarines, and supply ships.
Why does it matter that this is a Made-in-India warship?
- Only five or six nations currently have the capability of manufacturing an aircraft carrier — India joins this elite club now.
- According to the Navy, over 76 per cent of the material and equipment on board IAC-1 is indigenous.
- India’s earlier aircraft carriers were either built by the British or the Russians.
- The INS Vikramaditya, currently the Navy’s only aircraft carrier that was commissioned in 2013, started out as the Soviet-Russian Admiral Gorshkov.
- The country’s two earlier carriers, INS Vikrant and INS Viraat, were originally the British-built HMS Hercules and HMS Hermes before being commissioned into the Navy in 1961 and 1987 respectively.
Why will this warship be named INS Vikrant?
- INS Vikrant, a Majestic-class 19,500-tonne warship, was the name of India’s much-loved first aircraft carrier, a source of immense national pride over several decades of service before it was decommissioned in 1997.
- India acquired the Vikrant from the United Kingdom in 1961, and the carrier played a stellar role in the 1971 war with Pakistan that led to the birth of Bangladesh.
Now that India has the capability, will it build more carriers?
- Since 2015, the Navy has been seeking approval to build a third aircraft carrier for the country, which, if approved, will become India’s second Indigenous Aircraft Carrier (IAC-2).
- This proposed carrier, to be named INS Vishal, is intended to be a giant 65,000-tonne vessel, much bigger than IAC-1 and the INS Vikramaditya.
- The Navy has been trying to convince the government of the “operational necessity” of having a third carrier.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Strategic Petroleum Reserves Programme
Mains level: Oil prices volatility and its impact on India
Under Phase II of the petroleum reserve program, the Government has approved two additional commercial-cum-strategic facilities at Chandikhol (Odisha) and Padur (TN) on Public-Private Partnership (PPP) model.
Strategic Petroleum Reserves Programme
- To ensure energy security, the govt had decided to set up 5 million metric tons (MMT) of strategic crude oil storage at three locations namely, Visakhapatnam, Mangalore, and Padur (near Udupi).
- These strategic storages would be in addition to the existing storage of crude oil and petroleum products with the oil companies and would serve as a cushion during any supply disruptions.
- The petroleum reserves established are strategic, and the crude oil stored in these reserves will be used during an oil shortage event, as and when declared so by the Government of India.
- The construction of the Strategic Crude Oil Storage facilities is being managed by Indian Strategic Petroleum Reserves Limited (ISPRL), a Special Purpose Vehicle.
Why need SPR?
- The Gulf War in 1990 caused a sharp rise in oil prices and a massive increase to India’s imports.
- During the subsequent 1991 Indian economic crisis, foreign exchange reserves could barely finance three weeks’ worth of imports while the government came close to defaulting on its financial obligations.
- India was able to resolve the crisis through policies that liberalized the economy. However, India continued to be impacted by the volatility of oil prices.
- In 1998, the AB Vajpayee administration proposed building petroleum reserves as a long-term solution to managing the oil market.
- Three storage facilities were built in underground locations in Mangalore, Visakhapatnam and Padur.
Construction of ISPR
- The crude oil storages are constructed in underground rock caverns and are located on the East and West coasts of India.
- Crude oil from these caverns can be supplied to the Indian Refineries either through pipelines or through a combination of pipelines and coastal movement.
- Underground rock caverns are considered the safest means of storing hydrocarbons.
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From UPSC perspective, the following things are important :
Prelims level: NASA-ISRO SAR
Mains level: Not Much
The NASA-ISRO Synthetic Aperture Radar satellite, aimed at making global measurement of land surface changes using advanced radar imaging, is proposed to be launched in early 2023, informed Earth Sciences Minister.
Note the key features of the Mission. Every statement has a unique information.
NASA-ISRO SAR
- NISAR is a joint collaboration for a dual-frequency L and S-band SAR for earth observation.
- NASA and Bengaluru-headquartered ISRO signed a partnership on September 30, 2014, to collaborate on and launch NISAR.
- The mission is targeted to launch in early 2022 from ISRO’s Sriharikota spaceport in Andhra Pradesh’s Nellore district, about 100km north of Chennai.
- It is capable of producing extremely high-resolution images for a joint earth observation satellite mission with NASA.
- It will be the first satellite mission to use two different radar frequencies (L-band and S-band) to measure changes in our planet’s surface less than a centimeter across.
Objectives of the NISAR
- NISAR will observe Earth’s land and ice-covered surfaces globally with 12-day regularity on ascending and descending passes, sampling Earth on average every six days for a baseline three-year mission.
- It will measure Earth’s changing ecosystems, dynamic surfaces, and ice masses, providing information about biomass, natural hazards, sea-level rise, and groundwater, and will support a host of other applications.
- It would also provide data on natural hazards including earthquakes, tsunamis, volcanoes, and landslides.
What are L and S Bands?
- L band waves are used for GPS units because they are able to penetrate clouds, fog, rain, storms, and vegetation.
- The S-band is used by airport surveillance radar for air traffic control, weather radar, surface ship radar, and some communications satellites, especially those used by NASA to communicate with the Space Shuttle and the International Space Station.
- NISAR uses a sophisticated information-processing technique known as SAR to produce extremely high-resolution images.
- Radar penetrates clouds and darkness, enabling NISAR to collect data day and night in any weather.
What is collaboration?
- NASA is providing the mission’s L-band SAR, a high-rate communication subsystem for science data, GPS receivers, a solid-state recorder, and payload data subsystem.
- ISRO is providing the spacecraft bus, the S-band radar, the launch vehicle, and associated launch services for the mission, whose goal is to make global measurements of the causes and consequences of land surface changes using advanced radar imaging.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Stellar Middle Age
Mains level: Not Much
Stars like our Sun can go through a mid-life crisis, according to new research carried out by scientists from IISER Kolkata.
Stellar Middle Age
- At about 4.6 billion years of age, the sun is middle-aged, that is, it will continue to live for roughly the same period.
- There are accurate methods for estimating the age of the Sun, such as by using radioactive dating of very old meteorites that have fallen on the Earth.
- However, for more distant stars which are similar in mass and age to the Sun, such methods are not possible.
- One of the methods used is called gyrochronology.
- There is a relationship between rotation rate and age, that is the rotation rate of a star slows down with age.
How does it occur?
- When the stellar wind escapes from the star, it carries away with it a part of the angular momentum of the star, which results in its slowing down.
- The stellar wind has two drivers: one is the high temperature of the outer atmosphere of stars – the corona – which results in an outward expansion and hence plasma winds that emanate out.
- The other is the magnetic field.
- The magnetic field actually heats the corona and so when magnetic activity is strong the winds are strong and since wind carries away the internal (rotational) angular momentum of the star, it slows down its rotation.
- This is called magnetic braking.
- As the star ages, due to this mechanism, its rotation slows down and this relationship is used in gyrochronology to estimate the age of the star.
Impact
- This can lead to dramatic changes in their activity and rotation rates.
- The study also provides an explanation for the breakdown of the long-established relation between rotation rate and age in middle-aged sunlike stars.
- However, there is a breakdown of the gyrochronology relationship, because, after midlife, a star’s rate of spin does not slow down with age as fast as it was slowing down earlier.
- Another intriguing fact is that the Sun’s activity level has been observed to be much lower than other stars of similar age.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: EOS-03, SSLV
Mains level: Not Much
Geo-imaging satellite for earth observation EOS-03, which would enable near real-time monitoring of natural disasters like floods and cyclones, is scheduled for launch in the third quarter of 2021.
EOS-03
- ISRO has realized a geo-imaging satellite, “EOS-03”, for Earth Observation from Geostationary Orbit.
- EOS-03 is capable of imaging the whole country four-five times daily and would enable near real-time monitoring of natural disasters like floods and cyclones.
- In addition to natural disasters, EOS-03 would also enable monitoring of water bodies, crops, vegetation condition, forest cover changes.
Other developments: Small Satellite Launch Vehicle (SSLV)
- The first developmental flight of the Small Satellite Launch Vehicle (SSLV) is scheduled for the fourth quarter of 2021 from the Satish Dhawan Space Centre, Sriharikota.
- The SSLV is a cost-effective, three-stage and all-solid launch vehicle with a payload capability of 500 kg to 500 km planar orbit or 300 kg to Sun-Synchronous Polar Orbit.
- It is ideal for the on-demand, quick turn-around launch of small satellites.
- The major technologies developed as part of SSLV are flexible nozzle control with electro-mechanical actuators for all stages, miniaturized avionics, and a velocity trimming module in the upper stage for precise satellite injection.
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From UPSC perspective, the following things are important :
Prelims level: International Space Station (ISS), Nauka
Mains level: Not Much
Pirs, a Russian module on the International Space Station (ISS) used as a docking port for spacecraft and as a door for cosmonauts to go out on spacewalks. In its place, Russia’s space agency Roscosmos will be attaching a significantly larger module called Nauka.
What does Russia’s new Nauka module do?
- Nauka, which is 42 feet long and weighs 20 tonnes, was supposed to be launched as early as 2007, as per the ISS’s original plan.
- Nauka — meaning “science” in Russian — is the biggest space laboratory Russia has launched to date, and will primarily serve as a research facility.
- It is also bringing to the ISS another oxygen generator, a spare bed, another toilet, and a robotic cargo crane built by the European Space Agency (ESA).
- The new module was sent into orbit using a Proton rocket — the most powerful in Russia’s space inventory — on July 21 and will take eight days to reach the ISS.
What kind of research goes on at the International Space Station?
- A space station is essentially a large spacecraft that remains in low-earth orbit for extended periods of time.
- It is like a large laboratory in space and allows astronauts to come aboard and stay for weeks or months to carry out experiments in microgravity.
- For over 20 years since its launch, humans have continuously lived and carried out scientific investigations on the $150 billion ISS under microgravity conditions, being able to make breakthroughs in research not possible on Earth.
Back2Basics: International Space Station (ISS)
- The International Space Station, which launched its first piece in 1998, is a large spacecraft that orbits around the Earth and is home to the astronauts.
- The ISS is currently the only active space station in the earth’s orbit.
- The first crew on the space station arrived on November 2, 2000.
- The space station is home to a minimum of six astronauts, with two bathrooms, a gymnasium, and a big bay window.
- It is a joint project between five participating space agencies -NASA (USA), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada).
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From UPSC perspective, the following things are important :
Prelims level: Thane Creek Flamingo Sanctuary
Mains level: Not Much
The Mumbai Metropolitan Region is likely to get its first Ramsar site at the Thane Creek Flamingo Sanctuary.
Thane Creek Flamingo Sanctuary
- The Maharashtra Government has declared the area along the western bank of Thane Creek as the “Thane Creek Flamingo Sanctuary” since 2015.
- It is Maharashtra’s second marine sanctuary after the Malvan sanctuary.
- It is recognized as an “Important Bird Area” by the Bombay Natural History Society.
About Ramsar Convention
- The Convention on Wetlands of International Importance (better known as the Ramsar Convention) is an international agreement promoting the conservation and wise use of wetlands.
- It is the only global treaty to focus on a single ecosystem.
- The convention was adopted in the Iranian city of Ramsar in 1971 and came into force in 1975.
- Traditionally viewed as a wasteland or breeding ground of disease, wetlands actually provide fresh water and food and serve as nature’s shock absorber.
- Wetlands, critical for biodiversity, are disappearing rapidly, with recent estimates showing that 64% or more of the world’s wetlands have vanished since 1900.
- Major changes in land use for agriculture and grazing, water diversion for dams and canals, and infrastructure development are considered to be some of the main causes of loss and degradation of wetlands.
What does one mean by Ramsar Site?
- A Ramsar Site is a wetland area designated to be of international importance under the Ramsar Convention.
- It provides the framework for national action and international cooperation for the conservation and wise use of wetlands and their resources.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Gold Reserves in India
Mains level: Not Much
The Minister of Mines and Coal has provided useful information regarding gold reserves in India.
Gold Reserves in India
- As per National Mineral Inventory data, the total reserves/resources of gold ore (primary) in the country have been estimated at 501.83 million tonnes as of 2015.
- Out of these, 17.22 million tonnes were placed under the reserves category and the remaining 484.61 million tonnes were under the remaining resources category.
- In India, the largest resources of gold ore (primary) are located in Bihar (44%) followed by Rajasthan (25%), Karnataka (21%), West Bengal (3%), Andhra Pradesh (3% ), Jharkhand (2 %).
- The remaining 2% resources of ore are located in Chhattisgarh, Madhya Pradesh, Kerala, Maharashtra, and Tamil Nadu.
Who takes up their mapping?
- Geological Survey of India (GSI) is actively engaged in geological mapping followed by mineral exploration (survey) for various mineral commodities including gold.
- GSI aims to identify potential mineral-rich zones and establish resources.
- Every year, as per the approved annual Field Season Program, GSI takes up mineral exploration projects in various parts of the country for augmenting mineral resources.
- Recently, GoI has amended the MEMC Rules to allow auction of composite license at G4 level for deep-seated minerals including Gold.
Answer this PYQ in the comment box:
Consider the following statements:
- In India, State Governments do not have the power to auction non -coal mines.
- Andhra Pradesh and Jharkhand do not have goldmines.
- Rajasthan has iron ore mines.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 2 only
(c) 1 and 3 only
(d) 3 only
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From UPSC perspective, the following things are important :
Prelims level: Exoplanets
Mains level: Core accretion
Scientists for the first time have spotted a Moon-forming region around an exo-planet beyond our solar system.
What are Exoplanets?
- More than 4,400 planets have been discovered outside our solar system, called exoplanets.
- Most orbit other stars, but free-floating exoplanets, called rogue planets, orbit the galactic center and are untethered to any star.
- No circumplanetary discs had been found until now because all the known exoplanets resided in “mature” – fully developed – solar systems, except the two infant gas planets orbiting PDS 70.
What is the new finding?
- The researchers have detected a disc of swirling material accumulating around one of two newborn planets.
- They were seen orbiting a young star called PDS 70, located a relatively close 370 light-years from Earth.
- It is called a circumplanetary disc, and it is from these those moons are born.
- The discovery offers a deeper understanding of the formation of planets and moons.
Focus of the finding: Formation of disc
- In our solar system, the impressive rings of Saturn, a planet around which more than 80 moons orbit, represent a relic of a primordial moon-forming disc.
- The orange-colored star PDS 70, roughly the same mass as our Sun, is about 5 million years old– a blink of the eye in cosmic time.
- The two planets are even younger. Both planets are similar (although larger) to Jupiter, a gas giant.
- It was around one of the two planets, called PDS 70c, that a Moon-forming disc was observed.
Observing birth of a moon: Core Accretion
- Stars burst to life within clouds of interstellar gas and dust scattered throughout galaxies.
- Leftover material spinning around a new star then coalesces into planets, and circumplanetary discs surrounding some planets similarly yield moons.
- The dominant mechanism thought to underpin planet formation is called “core accretion”.
- In this scenario, small dust grains, coated in ice, gradually grow to larger and larger sizes through successive collisions with other grains.
- This continues until the grains have grown to a size of a planetary core, at which point the young planet has a strong enough gravitational potential to accrete gas which will form its atmosphere.
- Some nascent planets attract a disc of material around them, with the same process that gives rise to planets around a star leading to the formation of moons around planets.
- The disc around PDS 70c, with a diameter about equal to the distance of the Earth to the sun, possesses enough mass to produce up to three moons the size of Earth’s moon.
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From UPSC perspective, the following things are important :
Prelims level: Microplastic pollution
Mains level: Water Pollution
The Ganga is heavily polluted with microplastics at Varanasi, Haridwar, and Kanpur, Delhi-based non-profit Toxics Link claimed.
What are Microplastics?
- Microplastics are plastics that are less than 5 mm in size but are a major source of marine pollution.
- Untreated sewage from many cities along the river’s course, industrial waste, and religious offerings wrapped in non-degradable plastics pile pollutants into the river as it flows through several densely populated cities.
- The plastic products and waste materials released or dumped in the river break down and are eventually broken down into microparticles.
- The rivers finally transport significantly large quantities downstream into the ocean, which is the ultimate sink of all plastics being used by humans.
Microplastics in Ganga
- They are non-degradable plastics that often entered the Ganga through industrial waste or packaging of religious offerings, its research found.
- The density of population in the three cities also added to the problem because a large chunk of pollutants got directly discharged into the river by people living on the banks.
- Among the three cities, the Toxics Link’s study found that sites at Varanasi showed the maximum load of microplastics in the water of the Ganga, as compared to the other two cities.
- This might be due to cumulative downstream pollution as well as industrial and human activities.
On a global high
- The researchers tried to compare the microplastics concentration in Ganga water with similar studies on other rivers across the globe.
- It included the Rhine in Europe, the Patapsco, Magothy, Rhode in North America, and the Elqui, Maipo, Biobio, and Maule in South America.
- They found the Ganga microplastics pollution was much higher.
- This was in spite of a higher per capita consumption of plastic in the European countries, North and South America, as compared to India.
How does it impact people?
- The Ganga is a source of water for not just drinking and bathing purposes but also for irrigation to a large extent.
- Microplastics in river water, if ingested in humans or other organisms, can cause toxicity through various means.
- Not only are these microplastics toxic themselves, they also have a tendency to absorb various toxins present in water, including harmful chemicals.
- Although some of the effects of microplastics on public health are understood, a lot still needs to be done.
Answer this PYQ in the comment box:
Q. Why is there a great concern about the ‘microbeads’ that are released into the environment? (CSP 2019)
(a) They are considered harmful to marine ecosystems.
(b) They are considered to cause skin cancer in children.
(c) They are small enough to be absorbed by crop plants in irrigated fields.
(d) They are often found to be used as food adulterants.
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From UPSC perspective, the following things are important :
Prelims level: Harela Festival
Mains level: Paper 1- Festivals in India
Villagers across Uttarakhand celebrated Harela, a festival of greenery, peace, prosperity and environmental conservation.
Harela Festival
- Harela means ‘day of green’ and is celebrated in the month of Shravan (the fifth month of the Hindu lunar calendar) to worship Lord Shiva and Goddess Parvati.
- People across Uttarakhand, especially the Kumaun region, associate greenery with prosperity.
- The seeds of five to seven types of crops — maize, til (sesame), urad (black gram), mustard, oats — are sown in donas (bowl made of leaves) or ringalare (hill bamboo baskets) nine days before the festival.
- They are harvested on the ninth day and distributed to neighbours, friends and relatives.
- The flourish of the crops symbolizes prosperity in the year ahead.
- People make clay statues of Lord Shiva and Goddess Parvati, known as Dikare, and worship them a day before the festival.
- Harela is also linked to the Barahnaza system (12 types of crops), a crop diversification technique followed in the region.
Answer this PYQ in the comment box:
Q.Consider the following pairs:
Tradition: State
1. Chapchar Kut: festival Mizoram
2. Khongjom Parba ballad: Manipur
3. Thang Ta dance: Sikkim
Which of the pairs given above is/are correct?
(a) 1 only
(b) 1 and 2
(c) 3 only
(d) 2 and 3
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Monkey B Virus
Mains level: Zoonotic Diseases
China has reported the first human death case with the Monkey B virus (BV).
What is Monkey B virus?
- The virus, initially isolated in 1932, is an alphaherpesvirus enzootic in macaques of the genus Macaca.
- B virus is the only identified old-world-monkey herpes virus that displays severe pathogenicity in humans.
Answer this question from our AWE initiative:
There is been an increase in occurance of zoonotic human infectious diseases are zoonotic . Give reasons for this. Also suggest ways to contain and decrease the frequency of such events.(250 Words)
How is it transmitted?
- The infection can be transmitted via direct contact and exchange of bodily secretions of monkeys and has a fatality rate of 70 per cent to 80 per cent.
- According to the Centre for Disease Control and Prevention, Macaque monkeys commonly have this virus, and it can be found in their saliva, feces, urine, or brain or spinal cord tissue.
- The virus may also be found in cells coming from an infected monkey in a lab. B virus can survive for hours on surfaces, particularly when moist.
When can a human get infected with B virus?
- Humans can get infected if they are bitten or scratched by an infected monkey.
Symptoms
- Symptoms typically start within one month of being exposed to B virus but could appear in as little as three to seven days.
- The first indications of B virus infection are typically flu-like symptoms such as fever and chills, muscle ache, fatigue and headache.
- Following this, a person may develop small blisters in the wound or area on the body that came in contact with the monkey.
- Some other symptoms of the infection include shortness of breath, nausea and vomiting, abdominal pain and hiccups.
- As the disease progresses, the virus spreads to and causes inflammation (swelling) of the brain and spinal cord, leading to neurologic and inflammatory symptoms.
Is there a vaccine against B virus?
- Currently, there are no vaccines that can protect against B virus infection.
Who are at higher risk for infection?
- The virus might pose a potential threat to laboratory workers, veterinarians, and others who may be exposed to monkeys or their specimens.
- To date, only one case has been documented of an infected person spreading the B virus to another person.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Near-Earth Asteroid Scout
Mains level: Study of asteroids
Last week, NASA announced that its new spacecraft, named NEA Scout, has completed all required tests and has been safely tucked inside the Space Launch System (SLS) rocket.
For landing on Moon
- NEA Scout is one of several payloads that will hitch a ride on Artemis I, which is expected to be launched in November.
- Artemis I will be an uncrewed test-flight of the Orion spacecraft and SLS rocket.
- Under the Artemis programme, NASA has aimed to land the first woman on the Moon in 2024 and also establish sustainable lunar exploration programs by 2030.
What is NEA Scout?
- Near-Earth Asteroid Scout, or NEA Scout, is a small spacecraft, about the size of a big shoebox. Its main mission is to fly by and collect data from a near-Earth asteroid.
- It will also be America’s first interplanetary mission using special solar sail propulsion.
- This type of propulsion is especially useful for small, lightweight spacecraft that cannot carry large amounts of conventional rocket propellant.
- NEA Scout will use stainless steel alloy booms and deploy an aluminium-coated sail measuring 925 square feet.
- The large-area sail will generate thrust by reflecting sunlight.
- Energetic particles of sunlight bounce off the solar sail to give it a gentle, yet constant push.
How will it study the asteroid?
- NEA Scout is equipped with special cameras and can take pictures ranging from 50 cm/pixels to 10 cm/pixels.
- It can also process the image and reduce the file sizes before sending them to the earth-based Deep Space Network via its medium-gain antenna.
- The spacecraft will take about two years to cruise to the asteroid and will be about 93 million miles away from Earth during the asteroid encounter.
Why should we study near-Earth asteroids?
- Despite their size, some of these small asteroids could pose a threat to Earth.
- Understanding their properties could help us develop strategies for reducing the potential damage caused in the event of an impact.
- Scientists will use this data to determine what is required to reduce risk, increase effectiveness, and improve the design and operations of robotic and human space exploration.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Our planetary system
Mains level: Not Much
Researchers have developed a model showing that the density, mass and iron content of a Mercury’s core is influenced by its distance from the Sun’s magnetic field.
About Mercury
- Mercury is the first and the smallest planet in our solar system.
- It is also the closest planet to Earth.
- Like the other three terrestrial planets, Mercury contains a core surrounded by a mantle and a crust.
- But unlike any other planet, Mercury’s core makes up a larger portion of the planet.
- MESSENGER was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury’s chemical composition, geology, and magnetic field.
- It was the analysis from the MESSENGER mission that tells: Mercury’s core is solid.
Mystery over the core
- It has long been known that Mercury’s core composition is made of liquid metal.
- The core itself is about 3,600 km across. Surrounding that is a 600 km thick mantle.
- And around that is the crust, which is believed to be 100-200 km thick.
- The crust is known to have narrow ridges that extend for hundreds of kilometres.
- This large core has long been one of the most intriguing mysteries about Mercury.
Why does Mercury have a large core?
- A new study reveals that the sun’s magnetism is the reason.
- The sun’s magnetic field influences the density, mass, and iron content of Mercury’s core.
- The four inner planets of our solar system—Mercury, Venus, Earth, and Mars—are made up of different proportions of metal and rock.
- A gradient in which the metal content in the core drops off as the planets get farther from the sun.
- The researchers explain how this happened by showing that the sun’s magnetic field controlled the distribution of raw materials in the early forming solar system.
What are the key propositions?
- During the early formation of the solar system, when a swirling dust storm and gas encircled the sun, iron’s grain was drawn toward the centre by the sun’s magnetic field.
- At the time of planet formation from clumps of that dust and gas, planets nearer to the sun consolidated more iron into their centres than those farther away.
- Scientists also found that the density and proportion of iron in the planet’s core correlate with the strength of the magnetic field around the sun during planetary formation.
- Existing models on planetary formation were used to determine the speed at which gas and dust were pulled into the centre of our solar system during its formation.
- The magnetic field that the sun would have generated as it burst into being and calculated how that magnetic field would draw iron through the dust and gas cloud.
Cooling led solidification
- As the early solar system began to cool, dust and gas that were not drawn into the sun started to clump together.
- The clumps closer to the sun would have been exposed to a stronger magnetic field and thus would contain more iron than those farther away from the sun.
- As the clumps coalesced and cooled into spinning planets, gravitational forces drew the iron into their core.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Moon wobble
Mains level: Moon wobble and climate change
US coastlines will face increasing flooding in the mid-2030s due to a regular lunar cycle called the wobble effect that will magnify rising sea levels caused by climate change.
What is the Moon Wobble?
- The moon wobble is nothing but a regular swaying in the moon’s orbit.
- It was first documented way back in 1728.
- This wobble takes over an 18.6-year period to complete and continues in a cyclic fashion.
How does this wobble occur?
- High tides on this planet are caused mostly by the pull of the moon’s gravity on a spinning Earth. On most beaches, you would see two high tides every 24 hours.
- The moon also revolves around the Earth about once a month, and that orbit is a little bit tilted.
- moon’s orbital plane around the Earth is at an approximate 5-degree incline to the Earth’s orbital plane around the sun.
- Because of that, the path of the moon’s orbit seems to fluctuate over time, completing a full cycle — sometimes referred to as a nodal cycle — every 18.6 years.
- At certain points along the cycle, the moon’s gravitational pull comes from such an angle that it yanks one of the day’s two high tides a little bit higher, at the expense of the other.
- This does not mean that the moon itself is wobbling, nor that its gravity is necessarily pulling at our oceans any more or less than usual.
What impact does this wobble have on Earth?
- Influences the ebb and flow of tides: The moon wobbles impacts the gravitational pull of the moon, and therefore, indirectly influences the ebb and flow of tides here on the Earth.
- One half of the 18.6-year cycle suppresses the tides, which means that the high tides get lower, while the low tides get higher than normal.
- Once this cycle completes, the situation flips—in the subsequent cycle, the tides are amplified, with high tides getting higher and low tides, lower.
- The lunar cycle is expected to shift again by mid-2030, and in the coming phase, the tides will amplify once again.
Moon wobble and climate change
- The upcoming changes in the lunar cycle will pose a serious threat, as the amplified high tides coupled with the rising sea levels will make the risk of flooding far greater across all coastal regions of the globe.
- The study predicts that the high tide-associated floods—also known as nuisance floods or sunny day floods—may occur in clusters that could last for months or even for longer periods!
- This surge will be closely associated with the position of the Moon, Earth and the Sun.
- When the Moon and Earth line up in specific ways with each other and the Sun, the resulting gravitational pull and the ocean’s corresponding response may leave city-dwellers coping with floods every day or two.
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Note4Students
From UPSC perspective, the following things are important :
Prelims level: Pegasus
Mains level: Whatsapp snooping
Telephone numbers of some noted Indian journalists were successfully snooped upon by an unidentified agency using Pegasus software.
Pegasus Spyware
- All spyware do what the name suggests — they spy on people through their phones.
- Pegasus works by sending an exploit link, and if the target user clicks on the link, the malware or the code that allows the surveillance is installed on the user’s phone.
- A presumably newer version of the malware does not even require a target user to click a link.
- Once Pegasus is installed, the attacker has complete access to the target user’s phone.
- The first reports on Pegasus’s spyware operations emerged in 2016, when Ahmed Mansoor, a human rights activist in the UAE, was targeted with an SMS link on his iPhone 6.
What is the new threat?
- Pegasus has evolved from its earlier spear-phishing methods using text links or messages to ‘zero-click’ attacks which do not require any action from the phone’s user.
- This had made what was without a doubt the most powerful spyware out there, more potent and almost impossible to detect or stop.
How do zero-click attacks work?
- A zero-click attack helps spyware like Pegasus gain control over a device without human interaction or human error.
- Zero-click attacks are hard to detect given their nature and hence even harder to prevent.
- Detection becomes even harder in encrypted environments where there is no visibility on the data packets being sent or received.
- Most of these attacks exploit software that receive data even before it can determine whether what is coming in is trustworthy or not, like an email client.
Answer this PYQ from CSP 2018:
Q.The terms ‘WannaCry, Petya, Eternal Blue’ sometimes mentioned news recently are related to
(a) Exoplanets
(b) Crypto currency
(c) Cyber attacks
(d) Mini satellites
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