Free Astronomy and Space MCQs with Answers
286 Astronomy and Space MCQs from Everyday Science, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Astronomy covers the structure and motions of the solar system, planets, satellites, comets, asteroids and meteoroids, together with gravity, eclipses, seasons and phases of the Moon. It also introduces stars, galaxies, nebulae, black holes, space telescopes and satellites, while distinguishing rotation from revolution and meteors from meteorites.
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- A. Venus
- B. Mercury
- C. Earth
- D. Mars
Explanation: Mercury is the closest planet to the Sun and also the smallest planet in the solar system.
Correct answer: Mercury- A. Mars
- B. Jupiter
- C. Saturn
- D. Uranus
Explanation: Saturn is famous for its broad, bright system of icy rings, which makes it the standard answer.
Correct answer: Saturn- A. December
- B. February
- C. May
- D. None
Explanation: February is short enough that, in some years, its interval contains no new moon.
Correct answer: February- A. Venus
- B. Pluto
- C. Jupiter
- D. None
Explanation: Jupiter is the largest planet in the Solar System, with a mass greater than all the other planets combined.
Correct answer: Jupiter- A. Reflection of light
- B. Polarization of light
- C. refraction of light
- D. Interference of light
- E. None of these
Explanation: Starlight is repeatedly refracted by moving layers of Earth's atmosphere, making the star's apparent brightness and position fluctuate.
Correct answer: refraction of light- A. Energy
- B. Time
- C. Power
- D. Distance
- E. None of these
Explanation: A parsec is a large astronomical unit of distance, equal to about 3.26 light-years.
Correct answer: Distance- A. In asteroid belt between the orbits of Mars and Jupiter
- B. In asteroid belt between the orbits of Mars and Venus
- C. In asteroid belt between the orbits of Jupiter and Venus
- D. Everywhere in the sky
- E. None of these
Explanation: Most asteroids orbit the Sun in the main asteroid belt between Mars and Jupiter. Gravitational effects from Jupiter help maintain this belt.
Correct answer: In asteroid belt between the orbits of Mars and Jupiter- A. Aphelion
- B. Perihelion
- C. Perigee
- D. Apogee
- E. None of these
Explanation: Aphelion is the point in Earth's orbit farthest from the Sun, while perihelion is the nearest point.
Correct answer: Aphelion- A. Orion
- B. Columbia
- C. Canis Major
- D. Taurus
- E. None of these
Explanation: Orion is commonly described as the most prominent or magnificent constellation because it is large, bright and easily recognized by its…
Correct answer: Orion- A. 88 days
- B. 365 days
- C. 2 years
- D. 98 days
- E. None of these
Explanation: Mercury is the closest planet to the Sun and completes one orbit in about 88 Earth days.
Correct answer: 88 days- A. Archimedes
- B. William Gilbert
- C. Nicolas Copernicus
- D. Michael Faraday
- E. None of these
Explanation: Nicolaus Copernicus founded modern astronomy by proposing the heliocentric model, placing the Sun at the centre of the planetary system.
Correct answer: Nicolas Copernicus- A. Endobiology
- B. Exobiology
- C. Enterobiology
- D. Neobiology
- E. Micro biology
Explanation: Exobiology, also called astrobiology, studies the possibility, origin and distribution of life beyond Earth.
Correct answer: Exobiology- A. James webb 5.0 telescope
- B. Giant Magellan space telescope
- C. The Vainu Bappu Telescope
- D. Hubble space telescope 2.0
Explanation: The Giant Magellan Telescope is designed as an extremely large ground-based optical telescope, using several primary mirrors to achieve…
Correct answer: Giant Magellan space telescope- A. 2065
- B. 2061
- C. 2040
- D. None of These
Explanation: Halley's Comet takes about 75 years to orbit the Sun, so its return after 1986 is expected in 2061.
Correct answer: 2061- A. 10 - 20
- B. 20 - 30
- C. 30 - 40
- D. 40 - 50
Explanation: Modern measurements place the Big Bang at about 13.8 billion years ago, which falls within the 10–20 billion-year range.
Correct answer: 10 - 20- A. 3
- B. 4
- C. 5
- D. 6Physics
Explanation: Five planets can normally be seen with the unaided eye: Mercury, Venus, Mars, Jupiter and Saturn.
Correct answer: 5- A. Mars
- B. Saturn
- C. Uranus
- D. Jupiter
Explanation: Jupiter’s enormous mass and strong gravity can attract or deflect some comets and asteroids, leading to its popular description as Earth’s…
Correct answer: Jupiter18. 1 light year = ?
- A. 9.5×106 km
- B. 9.5×109 km
- C. 9.5×1012 km
- D. 9.5×1018 km
Explanation: A light-year is the distance light travels in one year, approximately 9.46 × 10¹² kilometres. It is a unit of distance, not time.
Correct answer: 9.5×1012 km- A. Saturn
- B. Venus
- C. Mars
- D. Jupiter
Explanation: The Great Red Spot is a gigantic, long-lasting storm in Jupiter’s atmosphere.
Correct answer: Jupiter- A. Mercury
- B. Venus
- C. Mars
- D. Jupiter
Explanation: Venus is the easiest planet to see because its clouds reflect sunlight strongly, making it the brightest planet in Earth’s sky.
Correct answer: VenusAstronomy and Space MCQs: common questions
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How many Astronomy and Space MCQs are on this page?
There are 286 Astronomy and Space MCQs in the Everyday Science bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Astronomy and Space MCQ have an explanation?
Yes. Each Astronomy and Space question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Astronomy and Space test?
Yes. The practice button on this page starts a free Astronomy and Space test drawn from the Everyday Science bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.