Quiz Archive
Astronomy Quiz Archive
Astronomy: Planets, Stars, Galaxies and the Universe
Revisit this archived Astronomy challenge through planetary science, stellar evolution, galaxies, black holes, exoplanets, cosmic distance and the tools astronomers use to study the universe.
🔭 Astronomy Quiz • ✨ 10 Verified Questions • ⏱️ 150 Seconds
🪐 Planets & Orbits
⭐ Stars & Galaxies
🌌 Black Holes & Exoplanets
🔭 Telescopes & Cosmic Scale
This archived edition preserves the original questions, explanations, answer review and scoring experience.
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1
Which planet is the largest in our solar system?
Correct answer: Jupiter. Jupiter is the largest planet in the solar system. NASA’s Juno mission continues to refine measurements of its size and shape, but it remains by far the biggest planet.
2
About how long does light from the Sun take to reach Earth?
Correct answer: About 8.3 minutes. Earth is roughly 150 million kilometers from the Sun, so sunlight takes a little over eight minutes to cross that distance.
3
How is the Milky Way best classified by its overall structure?
Correct answer: Barred spiral galaxy. Observations show that the Milky Way has a central bar of stars with major spiral arms extending outward. Our Sun lies in a smaller feature called the Orion Spur.
4
What is the event horizon of a black hole?
Correct answer: The boundary beyond which even light cannot escape. At the event horizon, the escape speed exceeds the speed of light. Anything that crosses this boundary cannot send information back to an outside observer.
5
What does the transit method look for when astronomers search for exoplanets?
Correct answer: A small, repeating dip in a star’s brightness. When a planet crosses in front of its host star from our viewpoint, it blocks a tiny fraction of the starlight. Repeated transits can reveal the planet’s orbital period and help estimate its size.
6
What is a neutron star?
Correct answer: An extremely dense collapsed stellar core left after some massive-star supernovae. When a massive star undergoes core collapse, the remnant can become a neutron star if the core is not massive enough to form a black hole.
7
Why does the Moon show nearly the same face toward Earth throughout its orbit?
Correct answer: It rotates once in about the same time it takes to orbit Earth. This synchronous rotation is a form of tidal locking. The Moon does rotate; its rotation period closely matches its orbital period around Earth.
8
What distance does one astronomical unit, or AU, represent?
Correct answer: The average distance from Earth to the Sun. One AU is about 150 million kilometers, or 93 million miles, and is a convenient unit for comparing distances within planetary systems.
9
Approximately how wide is the James Webb Space Telescope’s primary mirror?
Correct answer: 6.5 meters. Webb’s 18 hexagonal primary-mirror segments work together as a single 6.5-meter mirror, giving the infrared observatory a much larger light-collecting area than Hubble.
10
Which star is the closest known star to the Sun?
Correct answer: Proxima Centauri. Proxima Centauri is a red dwarf a little over four light-years away and is the nearest known star to our Sun. It belongs to the Alpha Centauri triple-star system.
Reference sources: The facts and explanations in this archived quiz were checked against NASA’s 2026 Juno Jupiter report, NASA’s Earth facts, NASA’s Milky Way explainer, NASA’s black-hole anatomy guide, NASA’s Exoplanet Watch transit-method background, NASA’s neutron-star resources, NASA’s Moon questions and answers, NASA’s Voyager astronomical-unit explainer, NASA’s Webb mirror guide, and NASA’s Proxima Centauri profile.