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Astronomy & Space Quiz Worksheet

QUIZLINO
Set 1 · Mixed
Name:Class / Group:Score:     / 20

Choose the best answer for each question. The answer key is on the last page.

  1. Which ISRO mission was India's first dedicated solar observation mission?
    A. Chandrayaan-2 B. Mangalyaan C. Aditya-L1 D. Astrosat
  2. What is the name of the region surrounding a planet where its gravity dominates the attraction of satellites?
    A. Roche Limit B. Hill Sphere C. Magnetosphere D. Heliosphere
  3. Which mission made the first successful soft landing on the Moon?
    A. Luna 9 B. Apollo 11 C. Surveyor 1 D. Luna 2
  4. Which moon of Mars is the larger of the two?
    A. Deimos B. Phobos C. Europa D. Triton
  5. Which star is expected to become the North Star about 12,000 years from now due to Earth's axial precession?
    A. Sirius B. Vega C. Deneb D. Arcturus
  6. Which planet has two small moons named Phobos and Deimos?
    A. Mars B. Jupiter C. Saturn D. Neptune
  7. Which NASA rover successfully landed on Mars in 2021?
    A. Spirit B. Opportunity C. Curiosity D. Perseverance
  8. Which planet has the strongest surface gravity among the terrestrial planets?
    A. Mercury B. Venus C. Earth D. Mars
  9. Which constellation contains the North Star, Polaris?
    A. Orion B. Ursa Major C. Ursa Minor D. Cassiopeia
  10. What is the name of the closest star to Earth after the Sun?
    A. Sirius B. Alpha Centauri A C. Proxima Centauri D. Betelgeuse
  11. What is the name of the region between Mars and Jupiter containing numerous rocky objects?
    A. Kuiper Belt B. Oort Cloud C. Asteroid Belt D. Van Allen Belt
  12. Which planet has the longest-lasting atmospheric storms in the Solar System?
    A. Mars B. Jupiter C. Mercury D. Venus
  13. What is the term for a planet passing directly between its star and an observer, causing a measurable dip in starlight?
    A. Transit B. Eclipse C. Occultation D. Reflection
  14. Which ESA mission is currently traveling to Mercury for detailed study?
    A. Gaia B. Rosetta C. BepiColombo D. Cluster
  15. Which NASA mission has been continuously exploring Jupiter since arriving there in 2016?
    A. Galileo B. Dawn C. Juno D. Messenger
  16. What is the name of the bright streak produced when a space rock enters Earth's atmosphere?
    A. Meteor B. Meteorite C. Asteroid D. Comet
  17. What is the primary gas found in Jupiter's atmosphere?
    A. Oxygen B. Carbon Dioxide C. Hydrogen D. Nitrogen
  18. Which moon of Saturn is often called the "Death Star Moon" because of its appearance?
    A. Titan B. Enceladus C. Mimas D. Rhea
  19. What is the term for a cloud of gas and dust collapsing under gravity to form a new star?
    A. Protoplanetary disk B. Stellar nursery C. Asteroid belt D. Magnetosphere
  20. Which spacecraft was the first to perform a flyby of Saturn?
    A. Cassini B. Voyager 1 C. Pioneer 11 D. Voyager 2
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Answer key – Astronomy & Space (Set 1)

  1. C. Aditya-L1 – Aditya-L1 is India's first space mission to study the Sun, launched by ISRO on 2 September 2023. It reached a halo orbit around the Lagrange point L1, about 1.5 million km from Earth, in January 2024, where it can watch the Sun continuously without any eclipses.
  2. B. Hill Sphere – The Hill sphere is the region around a planet where its gravity is stronger than the Sun's pull on orbiting objects, so moons can stay in stable orbits within it. Its size depends on the planet's mass and distance from the Sun. American astronomer George William Hill defined it.
  3. A. Luna 9 – The Soviet Luna 9 made the first successful soft landing on the Moon on 3 February 1966. It sent back the first photographs from the lunar surface, proving the ground was firm enough to support a spacecraft and not deep dust as some had feared.
  4. B. Phobos – Phobos is the larger of Mars's two moons, about 22 km across, while Deimos is about 12 km. Both were discovered by Asaph Hall in 1877. Phobos orbits so close to Mars that it is slowly spiralling inward and may break apart or crash into the planet in about 50 million years.
  5. B. Vega – Earth's axis slowly wobbles in a cycle of about 26,000 years, a motion called precession. This changes which star sits above the North Pole. In about 12,000 years, the bright star Vega in Lyra will be close to the celestial north pole, replacing Polaris as the 'North Star'.
  6. A. Mars – Mars has two small, irregularly shaped moons, Phobos and Deimos, named after the sons of Ares, the Greek god of war, meaning 'fear' and 'dread'. They may be captured asteroids or debris from a large impact on Mars. Japan's MMX mission aims to bring back samples from Phobos.
  7. D. Perseverance – NASA's Perseverance rover landed in Jezero Crater on Mars on 18 February 2021. It is searching for signs of ancient microbial life in an old river delta and is collecting rock samples in tubes for a future return mission. It also carried Ingenuity, the first helicopter to fly on another planet.
  8. C. Earth – Among the rocky (terrestrial) planets, Earth has the strongest surface gravity, about 9.8 m/s². Venus is close behind at about 8.9 m/s², while Mars and Mercury have only about 3.7 m/s². A person weighing 60 kg on Earth would feel like about 23 kg on Mars.
  9. C. Ursa Minor – Polaris, the North Star, is in the constellation Ursa Minor (the Little Bear), at the end of the handle of the Little Dipper. It sits almost directly above Earth's North Pole, so it barely moves in the night sky. Travellers have used it for centuries to find north.
  10. C. Proxima Centauri – Proxima Centauri is the closest known star to Earth after the Sun, about 4.24 light-years away. It is a small, dim red dwarf that cannot be seen without a telescope. It belongs to the Alpha Centauri system and has at least one planet, Proxima b, in its habitable zone.
  11. C. Asteroid Belt – The asteroid belt lies between the orbits of Mars and Jupiter and contains millions of rocky objects. Despite movie scenes, they are very far apart, and spacecraft pass through easily. Jupiter's strong gravity probably stopped this material from forming a planet.
  12. B. Jupiter – Jupiter has the longest-lasting storms in the Solar System. Its Great Red Spot has raged for at least 190 years and possibly over 350. Jupiter has no solid surface to slow storms down, and its internal heat keeps fuelling them, allowing them to last for centuries.
  13. A. Transit – A transit happens when a planet passes directly between its star and an observer, blocking a tiny fraction of the starlight. This dip in brightness reveals the planet's size and orbit. From Earth, we can see transits of Mercury and Venus across the Sun; the next Venus transit will occur in 2117.
  14. C. BepiColombo – BepiColombo, a joint mission of the European Space Agency and Japan's JAXA, launched in 2018 and is travelling to Mercury using several planetary flybys. It is scheduled to enter orbit in late 2026, where its two orbiters will study Mercury's surface, interior and magnetic field.
  15. C. Juno – NASA's Juno spacecraft has been orbiting Jupiter since July 2016, studying its interior, gravity, magnetic field and polar regions. Juno found that Jupiter's poles are covered in clusters of giant cyclones. It is solar-powered, a first for a mission so far from the Sun.
  16. A. Meteor – A meteor is the bright streak of light seen when a space rock burns up in Earth's atmosphere, popularly called a 'shooting star'. Most are made by particles no bigger than a grain of sand. During meteor showers, such as the Perseids in August, dozens can be seen each hour.
  17. C. Hydrogen – Hydrogen makes up about 90% of Jupiter's atmosphere by volume, with helium making up most of the rest. Small amounts of methane, ammonia and water form its colourful cloud bands. Jupiter's composition is similar to the Sun's, but it was not massive enough to start fusion.
  18. C. Mimas – Mimas, a small moon of Saturn, is nicknamed the 'Death Star Moon' because its giant Herschel crater makes it look like the space station from Star Wars. The crater is about 130 km wide, nearly a third of the moon's diameter. In 2024 scientists reported evidence of a young ocean beneath its surface.
  19. B. Stellar nursery – A stellar nursery is a dense cloud of gas and dust, often called a molecular cloud or nebula, where clumps collapse under gravity to form new stars. The Eagle Nebula's 'Pillars of Creation' are a famous example. Young stars inside are usually hidden by dust and are seen best in infrared.
  20. C. Pioneer 11 – NASA's Pioneer 11 was the first spacecraft to fly past Saturn, in September 1979, coming within about 21,000 km of its cloud tops. It discovered Saturn's F ring and a small moon, and tested the route through the rings later used by the Voyager probes.