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Type: Prelims Only

  • Monsoon Updates

    What is lightning, and how does it strike?

    Prelims Only | Science Tech | Mains Paper 3: Achievements Of Indians In S&T

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Lightening and Thunderstorms

    Mains level: Not Much

    With the monsoon making a slow revival over several parts of India, except the northwest region, there is a rise in lightning-linked deaths.

    What is lightning?

    • Lightning is a very rapid — and massive — discharge of electricity in the atmosphere, some of which is directed towards the Earth’s surface.
    • These discharges are generated in giant moisture-bearing clouds that are 10-12 km tall.
    • The base of these clouds typically lies within 1-2 km of the Earth’s surface, while their top is 12-13 km away.
    • Temperatures towards the top of these clouds are in the range of minus 35 to minus 45 degrees Celsius.

    How does it strike?

    • As water vapour moves upward in the cloud, the falling temperature causes it to condense.
    • Heat is generated in the process, which pushes the molecules of water further up.
    • As they move to temperatures below zero degrees Celsius, the water droplets change into small ice crystals. They continue to move up, gathering mass — until they are so heavy that they start to fall to Earth.
    • This leads to a system in which, simultaneously, smaller ice crystals are moving up and bigger crystals are coming down.
    • Collisions follow and trigger the release of electrons — a process that is very similar to the generation of sparks of electricity.
    • As the moving free electrons cause more collisions and more electrons, a chain reaction ensues.
    • This process results in a situation in which the top layer of the cloud gets positively charged, while the middle layer is negatively charged.

    Making of the thunder

    • The electrical potential difference between the two layers is huge — of the order of a billion to 10 billion volts.
    • In very little time, a massive current, of the order of 100,000 to a million amperes, starts to flow between the layers.
    • An enormous amount of heat is produced, and this leads to the heating of the air column between the two layers of the cloud.
    • This heat gives the air column a reddish appearance during lightning. As the heated air column expands, it produces shock waves that result in thunder.

    How does this current reach the Earth from the cloud?

    • While the Earth is a good conductor of electricity, it is electrically neutral.
    • However, in comparison to the middle layer of the cloud, it becomes positively charged.
    • As a result, about 15%-20% of the current gets directed towards the Earth as well.
    • It is this flow of current that results in damage to life and property on Earth.
    • There is a greater probability of lightning striking tall objects such as trees, towers or buildings.
    • Once it is about 80-100 m from the surface, lightning tends to change course towards these taller objects.
    • This happens because air is a poor conductor of electricity, and electrons that are travelling through air seek both a better conductor and the shortest route to the relatively positively charged Earth’s surface.

    What precautions should be taken against lightning?

    • Lightning rarely hits people directly — but such strikes are almost always fatal.
    • People are most commonly struck by what are called “ground currents”.
    • The electrical energy, after hitting a large object (such as a tree) on Earth, spreads laterally on the ground for some distance, and people in this area receive electrical shocks.
    • It becomes more dangerous if the ground is wet (which it frequently is because of the accompanying rain), or if there is metal or other conducting material on it.
    • Water is a conductor, and many people are struck by lightning while standing in flooded paddy fields.
    • For the reasons given above, taking shelter under a tree is dangerous. Lying flat on the ground too can increase risks.
    • People should move indoors in a storm; however, even indoors, they should avoid touching electrical fittings, wires, metal, and water.

    Answer this PYQ in the comment box:

    Q.During a thunderstorm, the thunder in the skies is produced by the:

    1. meeting of cumulonimbus clouds in the sky
    2. lightning that separates the nimbus clouds
    3. violent upward movement of air and water particles

    Select the correct option using the codes given below (CSP 2011):

    (a) 1 only

    (b) 2 and 3 only

    (c) 1 and 3 only

    (d) None of the above

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  • Blockchain Technology: Prospects and Challenges

    What is a Bitcoin Hardware Wallet and how it works?

    Prelims Only | Science Tech | Mains Paper 3: Achievements Of Indians In S&T

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Cryptocurrencies

    Mains level: Issues with Cryptocurrencies

    Last week, Twitter CEO announced his payments firm Square would soon build a hardware wallet to store bitcoin.

    Bitcoin Hardware Wallet

    • The wallet will be a type of plug-in device, much like a USB pen drive that stores, manages and secures a user’s crypto assets.
    • Each digital asset is linked to a cryptographic password called a ‘private key’ to allow users to access it.
    • This key safeguards cryptocurrencies from theft and unauthorized access.
    • The asset owner, with the help of a secure hardware wallet, can access the private key to buy and sell crypto assets from anywhere.
    • Most hardware wallets allow users to manage multiple accounts; some even allow users to connect to their Google or Facebook accounts.
    • Popular hardware wallets include Trezor, Ledger, KeepKey and Prokey.

    How is it different from a software wallet?

    • Cryptocurrency keys can be stored in two kinds of wallets – software and hardware.
    • Software wallets are like smartphone apps that digitally store private keys.
    • Most software wallets don’t charge users to store private keys but may collect a commission for trading via the app.
    • These wallets can be vulnerable to malware.
    • Hardware wallets and physical devices act like cold storage for confidential keys. The passwords are protected by a PIN, making it difficult for hackers to extract private keys as the information is not exposed to the Internet.

    The upsides of a hardware wallet

    • Hardware wallets are said to be convenient as they can be connected to trading exchanges to complete transactions.
    • Hardware wallets are often stored in a protected microcontroller and cannot be transferred out of the device, making them secure.
    • Their isolation from the Internet also mitigates the risk of the assets being compromised. Moreover, it does not rely on any third-party app.

    Limitations

    • Since the wallet is in physical form, the device could be stolen or destroyed.
    • They could be used by malicious actors to steal confidential data.
    • The device can also be expensive as compared to software wallets.
    • Some hardware wallets can also have complex features, making it difficult for first-timers to understand.

    Answer this PYQ in the comment box:

    Q.With reference to “Blockchain Technology”, consider the following statements:

    1. It is a public ledger that everyone can inspect but which no single user controls.
    2. The structure and design of block chain is such that all the data in it are about crypto currency only.
    3. Applications that depend on basic features of blockchain can be developed without anybody’s permission.

    Which of the statement given above is/are correct?

    (a) 1 only

    (b) 2 only

    (b) 1 and 2 only

    (d) 1 and 3

    Back2Basics: Cryptocurrencies

    • A cryptocurrency is a digital asset designed to work as a medium of exchange wherein individual coin ownership records are stored in a ledger existing in a form of a computerized database.
    • It uses strong cryptography to secure transaction records, control the creation of additional coins, and verify the transfer of coin ownership.
    • It typically does not exist in physical form (like paper money) and is typically not issued by a central authority.
    • Cryptocurrencies typically use decentralized control as opposed to centralized digital currency and central banking systems.

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  • RBI Notifications

    Retail Direct Scheme for G-Secs

    Prelims Only | Economics | Mains Paper 3:

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: G-Secs

    Mains level: Not Much

    The RBI has announced a scheme under which retail investors will be allowed to open retail direct gilt accounts (RDG) directly with the central bank.

    Retail Direct Scheme

    • The scheme is a one-stop solution to facilitate investment in government securities (G-secs) by individual investors.
    • Under RDG schemes, accounts can be opened through a dedicated online portal, which will provide registered users access to primary issuance of government securities and to NDS-OM.

    What is a gilt account?

    • A “Gilt Account” means an account opened and maintained for holding Government securities, by an entity or a person including ‘a person resident outside India’ with a “Custodian” permitted by the RBI.

    About Government Securities

    • These are debt instruments issued by the government to borrow money.
    • The two key categories are:
    1. Treasury bills (T-Bills) – short-term instruments which mature in 91 days, 182 days, or 364 days, and
    2. Dated securities – long-term instruments, which mature anywhere between 5 years and 40 years

    Note: T-Bills are issued only by the central government, and the interest on them is determined by market forces.

    Why G-Secs?

    • Like bank fixed deposits, g-secs are not tax-free.
    • They are generally considered the safest form of investment because they are backed by the government. So, the risk of default is almost nil.
    • However, they are not completely risk-free, since they are subject to fluctuations in interest rates.
    • Bank fixed deposits, on the other hand, are guaranteed only to the extent of Rs 5 lakh by the Deposit Insurance and Credit Guarantee Corporation (DICGC).

    Retail investors and G-Secs

    • Small investors can invest indirectly in g-secs by buying mutual funds or through certain policies issued by life insurance firms.
    • To encourage direct investment, the government and RBI have taken several steps in recent years.
    • Retail investors are allowed to place non-competitive bids in auctions of government bonds through their Demat accounts.
    • Stock exchanges act as aggregators and facilitators of retail bids.

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  • Foreign Policy Watch: India – EU

    EAM hands over relics of 17th century Georgian Queen St. Ketevan to Georgia

    Prelims Only | International Relations | Mains Paper 2: Bilateral, Regional and Global Groupings and agreements involving India

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Black Sea mapping

    Mains level: India-Georgia ties

    After a long-standing request of Georgia, External Affairs Minister handed over the holy relics of 17th century Georgian Queen St. Ketevan nearly 16 years after they were found in Goa.

    Who was St. Ketevan?

    • Queen Ketevan was a 17th century Georgian Queen.
    • From Kakheti, a kingdom in eastern Georgia, she was tortured and killed in 1624 in Shiraz during the rule of the Safavid dynasty.
    • Portuguese missionaries were said to have carried the relics to Goa in 1627.
    • In 2005, after years of research and study of medieval Portuguese records, the relics were found at the St. Augustine Church in Old Goa.

    Importance of Georgia for India

    • Georgia a strategically important country situated at the intersection of Eastern Europe and Western Asia.
    • Relations between Georgia and India date back to ancient times.
    • The Panchatantra influenced Georgian folk legends. During the medieval period, Georgian missionaries, travelers, and traders visited India.
    • Some Georgians served in the courts of Mughal emperors, and a few rose to the rank of governor.
    • India was among the first countries to officially recognize Georgia, doing so on 26 December 1991.
    • India is a net exporter to Georgia.
    • The main commodities exported by India to Georgia are cereals, nuclear reactors, boilers, machinery and mechanical appliances, pharmaceuticals, electrical machinery and equipment, aluminium and aluminium articles.

    Answer this PYQ in the comment box:

    Q.Consider the following pairs:

    Sea Bordering Country
    1. Adriatic Sea Albania
    2. Black Sea Croatia
    3. Caspian Sea Kazakhstan
    4. Mediterranean Sea Morocco
    5. Red Sea Syria

    Which of the pairs given above are correctly matched? (CSP 2019)

    (a) 1, 2 and 4 only

    (b) 1, 3 and 4 only

    (c) 2 and 5 only

    (d) 1, 2, 3, 4 and 5

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  • Interstate River Water Dispute

    Mekedatu Dam Project

    Prelims Only | Polity | Mains Paper 2: Federalism

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Mekedatu Project

    Mains level: Inter-state river disputes

    Karnataka and Tamil Nadu are again at the crossroads against the Mekedatu dam project in the Cauvery River Basin.

    What is the Mekedatu Project?

    • Mekedatu, meaning goat’s leap, is a deep gorge situated at the confluence of the rivers Cauvery and Arkavathi, about 100 km from Bengaluru, at the Kanakapura taluk in Karnataka’s Ramanagara district.
    • In 2013, then Karnataka announced the construction of a multi-purpose balancing reservoir project.
    • The project aimed to alleviate the drinking water problems of the Bengaluru and Ramanagara districts.
    • It was also expected to generate hydroelectricity to meet the power needs of the state.

    Issues with the project

    • Soon after the project was announced TN has objected over granting of permission or environmental clearance.
    • Explaining the potential for damage to the lower riparian state of TN, it said that the project was in violation of the final award of the Cauvery Water Disputes Tribunal.
    • It stated that the project will affect the natural flow of the river Cauvery considerably and will severely affect the irrigation in TN.

    What do the Cauvery Water Disputes Tribunal and the Supreme Court say?

    • The Cauvery Water Disputes Tribunal, in its final order on February 2007, made allocations to all the riparian States — Karnataka, Kerala and Tamil Nadu, apart from the Union Territory of Puducherry.
    • It also stipulated “tentative monthly deliveries during a normal year” to be made available by Karnataka to Tamil Nadu.
    • Aggrieved over the final order for different reasons, the States had appealed to the Supreme Court.
    • In February 2018, the court, in its judgment, revised the water allocation and increased the share of Karnataka by 14.75 thousand million cubic feet (tmc ft) at the cost of Tamil Nadu.
    • The enhanced quantum comprised 4.75 tmc ft for meeting drinking water and domestic requirements of Bengaluru and surrounding areas.

    What is Karnataka planning?

    • Encouraged by the Supreme Court verdict, Karnataka, which sees the order as an endorsement of its stand, has set out to pursue the Mekedatu project.
    • Originally proposed as a hydropower project, the revised Mekedatu dam project has more than one purpose to serve.
    • A hydropower plant of nearly 400 MW has also been proposed.
    • The Karnataka government has argued that the proposed reservoir will regulate the flow to Tamil Nadu on a monthly basis, as stipulated by the Tribunal and the Supreme Court.
    • This is why Karnataka has contended that the project will not affect the interests of Tamil Nadu farmers.

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  • Nobel and other Prizes

    2020 Millennium Technology Prize  

    Prelims Only | Science Tech | Mains Paper 3: Achievements Of Indians In S&T

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Next-generation DNA sequencing

    Mains level: Not Much

    The 2020 Millennium Technology Prize has been awarded to Shankar Balasubramanian and David Klenerman, for their development of revolutionary Next-generation DNA sequencing techniques.

    About Millennium Technology Prize

    • The Millennium Technology Prize is one of the world’s largest technology prizes.
    • It is awarded once every two years by Technology Academy Finland, an independent fund established by Finnish industry and the Finnish state in partnership.

    What is next-generation DNA sequencing?

    • Next-generation sequencing (NGS) is a massively parallel sequencing technology that offers ultra-high throughput, scalability, and speed.
    • The technology is used to determine the order of nucleotides in entire genomes or targeted regions of DNA or RNA.
    • These technologies allow for sequencing of DNA and RNA much more quickly and cheaply than the previously used sequencing.
    • NGS has revolutionized the biological sciences, allowing labs to perform a wide variety of applications and study biological systems at a level never before possible.
    • More than a million base pairs can be sequenced, which translates to hundreds of genes or even the whole genome of an organism.
    • This is made possible by simultaneously sequencing hundreds of pieces of DNA at the same time.

    What is sequencing, btw?

    • DNA (or RNA, in some viruses), the genetic material of life forms, is made of four bases (A, T, G and C; with U replacing T in the case of RNA).
    • A chromosome is the duplex of a long linear chain of these – and in the DNA sequence is information – the blueprint of life.
    • Life famously can replicate, and DNA replicates when an enzyme, DNA polymerase, synthesises a complementary strand using an existing DNA strand as the template.
    • The breakthrough idea of Balasubramanian and Klenerman was to sequence DNA (or RNA) using this process of strand synthesis.
    • They cleverly modified their ATGC bases so that each shone with a different colour.
    • When copied, the “coloured” copy of DNA could be deciphered from the colours alone, using miniature optical and electronic devices.

    What about the cost of all this sequencing?

    • When the Human Genome Project delivered the first, near-complete sequence of our genome, the cost was estimated to have been 3 billion dollars.
    • As all our chromosomes together have 3 billion base pairs, it becomes an easy calculation – One dollar per sequenced base.
    • By the year 2020, NGS technologies has pushed the price for sequencing to a few thousands of rupees.

    Back2Basics:

    What is the Human Genome Project?

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  • Forest Conservation Efforts – NFP, Western Ghats, etc.

    Sikkim is home to 27% of India’s flowering plants

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Conservation, Environmental Pollution & Degradation, Eia

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Flora of Sikkim

    Mains level: NA

    Sikkim, the smallest State with less than 1% of India’s landmass, is home to 27% of all flowering plants found in the country, reveals a recent publication by the Botanical Survey of India (BSI).

    Flora of Sikkim

    • Flora of Sikkim – A Pictorial Guide lists 4,912 naturally occurring flowering plants in the tiny Himalayan State.
    • The total number of naturally occurring flowering plants in the country is about 18,004 species, and with 4,912 species, the diversity of flowering plants in Sikkim, spread over an area of 7,096 sq. km. is very unique.

    Why is Sikkim a host to such large biodiversity?

    • Sikkim is a part of the Kanchenjunga biosphere landscape, has different altitudinal ecosystems, which provide opportunities for herbs and trees to grow and thrive.
    • The State also borders China, Bhutan and Nepal, and the Darjeeling Hills of West Bengal.
    • From subalpine vegetation to the temperate to the tropical, the State has different kinds of vegetation, and that is the reason for such a diversity of flora.
    • The elevation also varies between 300 to 8,598 metres above mean sea level, the apex being the top of Mt. Kanchenjunga (8,586 metres).

    Contribution by the Public

    • The people of Sikkim have a unique bond with nature and trees.
    • As per the Sikkim Forest Tree (Amity & Reverence) Rules, 2017 the State government allows any person to associate with trees standing on his or her private land or on any public land by entering into a Mith/Mit or Mitini relationship.
    • The notification encouraged people to adopt a tree “as if it was his or her own child in which case the tree shall be called an adopted tree”.

    Answer this PYQ in the comment box:

    Q.Which one of the following National Parks lies completely in the temperate alpine zone?

    (a) Manas National Park

    (b) Namdapha National Park

    (c) Neora Valley National Park

    (d) Valley of Flowers National Park

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  • Disasters and Disaster Management – Sendai Framework, Floods, Cyclones, etc.

    Graded Response Action Plan (GRAP)

    Prelims Only | Enviro & Biodiversity | Mains Paper 3: Disaster Management

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Graded Response Action Plan (GRAP)

    Mains level: Graded Response Action Plan (GRAP)

    Fearing any surge in coronavirus cases in the national capital, which is witnessing a decline in cases of infection, the Delhi government has chalked out the ‘Graded Response Action Plan (GRAP).’

    Graded Response Action Plan (GRAP)

    • In 2014, when a study by the WHO found that Delhi was the most polluted city in the world, panic spread in the Centre and the state government.
    • Approved by the Supreme Court in 2016, the plan was formulated after several meetings that the Environment Pollution (Prevention and Control) Authority (EPCA) held with state government and experts.
    • The result was a plan that institutionalized measures to be taken when air quality deteriorates.
    • GRAP also works as an emergency measure.
    • It includes strict measures such as a ban on the entry of heavy vehicles, the odd-even road rationing restrictions, and a halt of construction work – each of which is likely to be impractical at a time when the pandemic has exacted heavy economic costs and public transport has been seen as an infection risk.

    For covid purposes

    • This time, it was decided to notify the GRAP that will “objectively and transparently” ensure an “institutional and automatic” response with regards to enforcement measures, lockdowns and unlock activities.
    • The plan was prepared in comparison with ascent data of the four waves at specific positivity rates of 0.5%, 1%, 2% and 5% and also considered on the basis of the earlier four waves.

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  • International Space Agencies – Missions and Discoveries

    Possibility of life on Saturn’s Moon

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Methanogens on saturn's moon

    Mains level: Hunt for extra-terrestrial life

    NASA’s Cassini spacecraft has detected an unusually high concentration of methane, along with carbon dioxide and dihydrogen, in the moons of Saturn by flying through their plumes.

    What is the new observation?

    • The spacecraft has found that Titan has methane in its atmosphere and Enceladus has a liquid ocean with erupting plumes of gas and water.

    Are there methane-producing organisms on Earth?

    • Most of the methane on Earth has a biological origin.
    • Microorganisms called methanogens are capable of generating methane as a metabolic byproduct.
    • They do not require oxygen to live and are widely distributed in nature.
    • They are found in swamps, dead organic matter, and even in the human gut.
    • They are known to survive in high temperatures and simulation studies have shown that they can live in Martian conditions.
    • Methanogens have been widely studied to understand if they can be a contributor to global warming.

    Could there be methanogens on Enceladus?

    • We cannot conclude that life exists in the Enceladus ocean.
    • It is the probability that Enceladus’ hydrothermal vents could be habitable to Earth-like microorganisms.
    • There can be life hypotheses.

    What other processes could have produced the methane?

    • Methane could be formed by the chemical breakdown of organic matter present in Enceladus’ core.
    • Hydrothermal processes could help the formation of carbon dioxide and methane.
    • On Earth, hydrothermal vents on seafloors are known to release methane, but this happens at a very slow rate.
    • This hypothesis is plausible but only if Enceladus was formed through the accretion of organic-rich material from comets.
    • The results suggest that methane production from hydrothermal vents is not sufficient to explain the high methane concentration detected by Cassini in the plumes.
    • An additional amount of methane produced via biological methanogenesis could match Cassini’s observations.

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  • International Space Agencies – Missions and Discoveries

    Discrete Auroras on Mars

    Prelims Only | Science Tech | Mains Paper 3: Awareness in various sc and tech fields

    Note4Students

    From UPSC perspective, the following things are important:

    Prelims level: Aurora, Hope Mission

    Mains level: Study of Mars

    The UAE’s Hope spacecraft, which is orbiting Mars since February this year, has captured images of glowing atmospheric lights in the Red Planet’s night sky, known as discrete auroras.

    What causes an Aurora on Earth?

    • Auroras are caused when charged particles ejected from the Sun’s surface — called the solar wind — enter the Earth’s atmosphere.
    • These particles are harmful, and our planet is protected by the geomagnetic field, which preserves life by shielding us from the solar wind.
    • However, at the north and south poles, some of these solar wind particles are able to continuously stream down, and interact with different gases in the atmosphere to cause a display of light in the night sky.
    • This display, known as an aurora, is seen from the Earth’s high latitude regions (called the auroral oval), and is active all year round.

    Where are they observed on Earth?

    • In the northern part of our globe, the polar lights are called aurora borealis or Northern Lights and are seen from the US (Alaska), Canada, Iceland, Greenland, Norway, Sweden and Finland.
    • In the south, they are called aurora australis or southern lights and are visible from high latitudes in Antarctica, Chile, Argentina, New Zealand and Australia.

    So, how are Martian auroras different?

    • Unlike auroras on Earth, which are seen only near the north and south poles, discrete auroras on Mars are seen all around the planet at night time.
    • Unlike Earth, which has a strong magnetic field, the Martian magnetic field has largely died out.
    • This is because the molten iron at the interior of the planet– which produces magnetism– has cooled.
    • However, the Martian crust, which hardened billions of years ago when the magnetic field still existed, retains some magnetism.
    • So, in contrast with Earth, which acts like one single bar magnet, magnetism on Mars is unevenly distributed, with fields strewn across the planet and differing in direction and strength.
    • These disjointed fields channel the solar wind to different parts of the Martian atmosphere, creating “discrete” auroras over the entire surface of the planet as charged particles interact with atoms and molecules in the sky– as they do on Earth.

    Why is it important to study them?

    • Studying Martian auroras is important for scientists, for it can offer clues as to why the Red Planet lost its magnetic field and thick atmosphere– among the essential requirements for sustaining life.

    Answer this PYQ in the comment box:

    Q.Which region of Mars has a densely packed river deposit indicating this planet had water 3.5 billion years ago?

    (a) Aeolis Dorsa

    (b) Tharsis

    (c) Olympus Mons

    (d) Hellas

    Back2Basics:

    Hope Orbiter

    • The Hope Probe, the Arab world’s first mission to Mars, took off from Earth in July last year, and has been orbiting the Red Planet since February.
    • The primary objective of the mission is to study Martian weather dynamics.
    • By correlating the lower atmosphere and upper atmosphere conditions, the probe will look into how weather changes the escape of hydrogen and oxygen into space.
    • By measuring how much hydrogen and oxygen is spilling into space, scientists will be able to look into why Mars lost so much of its early atmosphere and liquid water.
    • It is expected to create the first complete portrait of the planet’s atmosphere.
    • With the information gathered during the mission, scientists will have a better understanding of the climate dynamics of different layers of Mars’ atmosphere.

    Mars

    • Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury.
    • In English, Mars carries the name of the Roman god of war and is often referred to as the “Red Planet”.
    • The latter refers to the effect of the iron oxide prevalent on Mars’s surface, which gives it a reddish appearance distinctive among the astronomical bodies visible to the naked eye.
    • Mars is a terrestrial planet with a thin atmosphere, with surface features reminiscent of the impact craters of the Moon and the valleys, deserts and polar ice caps of Earth.
    • The days and seasons are comparable to those of Earth, because the rotational period, as well as the tilt of the rotational axis relative to the ecliptic plane, is similar.
    • Mars is the site of Olympus Mons, the largest volcano and highest known mountain on any planet in the Solar System, and of Valles Marineris, one of the largest canyons in the Solar System.

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