Planets float around our solar system, light up the night sky, and hold a world of knowledge and wonder that we have barely scratched the surface of. Whether it’s gas giant planets, moons, or terrestrial planets that rotate around our sun, our solar systems knowledge can easily be challenged at any time. So that’s what we want to do with this planet trivia collection.
Planet Trivia
The massive behemoths that float around space in our system and across the Milky Way galaxy hold worlds of information and knowledge. So let’s look at some of the most well-known planet trivia that could fascinate you.
- The surface temperature on Mars can reach up to -220 degrees F at night during the wintertime.
- Jupiter’s largest moon is about 4.503 billion years old.
- The recognized dwarf planets in our solar system include Pluto, Eris, Ceres, Makemake, and Haumea.
- The largest planet ever discovered is ROXs 42Bb, which is 2.5 times bigger than Jupiter.
Planet Trivia Questions and Answers
Do you want to see for yourself how much planet trivia you know? Try out this planets and solar system quiz and see how many you answer right.
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| What three planets are closest to the Sun? | â–¶ Mercury, Venus & Earth |
| What planet in our solar system has the longest day? | â–¶ Venus (243 Earth days) |
| Which planet in our solar system spins the fastest? | â–¶ Jupiter, it rotates once on average in just under 10 hours. |
| Which planet has the most moons? | â–¶ Jupiter |
| Of the four rocky planets in our solar system, which is the largest and most dense? | â–¶ Earth |
| What’s the oldest planet in our solar system? | â–¶ Jupiter |
| What’s the second smallest planet in our solar system? | â–¶ Mars |
| What’s the brightest planet in earth’s night sky? | â–¶ Venus |
| What are the terrestrial planets in our solar system? | â–¶ Earth, Mars, Mercury and Venus |
| In 1781, what was the first planet to be discovered using the telescope? | â–¶ Uranus |
| What is the hottest planet in our solar system? | â–¶ Venus |
| Callisto is the name of a moon orbiting what planet in our solar system? | â–¶ Jupiter |
| Curiosity is a car-sized rover that was launched by NASA in 2011 to explore which planet? | â–¶ Mars |
| What planet in our solar system has the most gravity? | â–¶ Jupiter |
| Which planet is furthest from the sun? | â–¶ Neptune |
| How many planets in our solar system have moons? | â–¶ Six |
| Which planet in our solar system has the most oxygen? | â–¶ Earth |
| Ceres is a dwarf planet that lies between the orbits of which two planets in our solar system? | â–¶ Mars & Jupiter |
| Titan, Enceladus, Mimas & Iapetus are just some of the moons orbiting which planet? | â–¶ Saturn |
| Which planet in our solar system has an axis that is tilted by 98 degrees? | â–¶ Uranus |
| The Great Red Spot is a gigantic storm located on which planet in our solar system? | â–¶ Jupiter |
| In our solar system which two planets are known as ice giants? | â–¶ Uranus and Neptune |
| In our solar system, which planet has the shortest day? | â–¶ Jupiter |
| Where did a robot named Spirit remain operational over 2000 sols past its planned 90-sol mission? | â–¶ Mars |
| Ganymede, the largest moon in our solar system, belongs to which planet? | â–¶ Jupiter |
| Which planet’s moons are nearly all named after Shakespearean characters? | â–¶ Uranus |
| How many planets in our solar system are not named after a god or goddess? | â–¶ One, Earth |
| Named for the fleet-footed Roman messenger god, which planet has the shortest orbit around the sun? | â–¶ Mercury (87.97 days) |
| Which is the largest of Mars’ two moons? | â–¶ Phobos |
| What is the name of the closest planet to the sun? | â–¶ Mercury |
| What is the largest planet in the solar system? | â–¶ Jupiter |
| What is the smallest planet in the solar system? | â–¶ Mercury |
| What is the most distant planet visible to the naked eye? | â–¶ Saturn |
| Which planet has the most moons in the solar system? | â–¶ Jupiter |
| What is the only planet known to have active volcanoes besides Earth? | â–¶ Venus |
| Which planet has the longest day in the solar system? | â–¶ Venus |
| Which planet is often called the Red Planet? | â–¶ Mars |
| Which planet is known for having a hexagonal shaped storm on its north pole? | â–¶ Saturn |
| Which planet has the largest temperature variations in the solar system? | â–¶ Mercury |
| What is the name of the largest volcano in the solar system, located on Mars? | â–¶ Olympus Mons |
| What is the name of the largest canyon in the solar system, located on Mars? | â–¶ Valles Marineris |
| What is the name of the only planet in the solar system that rotates clockwise? | â–¶ Venus |
| Which planet has the highest mountain in the solar system, named Olympus Mons? | â–¶ Mars |
| Which planet has the shortest year in the solar system, taking only 88 Earth days to complete one orbit around the sun? | â–¶ Mercury |
| Which planet has the most eccentric orbit of all planets in the solar system? | â–¶ Pluto |
| What is the name of the Great Dark Spot, a storm in the atmosphere of Neptune? | â–¶ Great Dark Spot |
| Which planet has the most complex ring system in the solar system? | â–¶ Saturn |
| Which planet has the highest density in the solar system? | â–¶ Earth |
| What is the name of the largest moon in the solar system, which orbits Jupiter? | â–¶ Ganymede |
| How many exoplanets have been discovered so far? | â–¶ 5,307 |
| What is the name of the first exoplanet ever discovered? | â–¶ 51 Pegasi b |
| Which exoplanet has the shortest known year? | â–¶ PSR JK2-137b |
| What is the name of the first potentially habitable exoplanet discovered? | â–¶ Gliese 581g |
| Which exoplanet has the longest known year? | â–¶ Kepler-438b |
| Which exoplanet has the highest known surface temperature? | â–¶ KELT-9b |
| What is the name of the exoplanet with the shortest known orbital period? | â–¶ K2-137b |
| Which exoplanet has the highest known mass? | â–¶ HR 2562 b |
| What is the name of the first exoplanet discovered by NASA’s TESS mission? | â–¶ Pi Mensae c |
| Which exoplanet is the most Earth-like in terms of its size and temperature? | â–¶ Kepler-438b |
| What is the name of the exoplanet with the longest known day? | ▶ β Pictoris b |
| Which exoplanet has the highest known density? | â–¶ Kepler-10b |
| What is the name of the exoplanet with the longest known night? | â–¶ TrES-2b |
| Which exoplanet is the closest to Earth in terms of its distance from its host star? | â–¶ Proxima Centauri b |
| What is the name of the exoplanet with the shortest known distance from its host star? | â–¶ WASP-189b |
| Which exoplanet has the largest known radius? | â–¶ WASP-107b |
| What is the name of the exoplanet with the longest known transit duration? | â–¶ Kepler-421b |
| Which exoplanet has the most eccentric orbit? | â–¶ HD 20782 b |
| What is the name of the first exoplanet discovered by the transit method? | â–¶ HD 209458 b |
| Which exoplanet has the highest known surface gravity? | â–¶ OGLE-2016-BLG-1195Lb |
| Who is credited with discovering the planet Uranus? | â–¶ William Herschel |
| What famous astronomer was the first person to observe Saturn’s rings? | â–¶ Galileo Galilei |
| Who discovered the dwarf planet Pluto? | â–¶ Clyde Tombaugh |
| What famous astronomer was the first person to observe the planet Venus in detail? | â–¶ Galileo Galilei |
| Who is known for discovering the four largest moons of Jupiter? | â–¶ Galileo Galilei |
| What astronomer first theorized the existence of the planet Neptune? | â–¶ John Couch Adams |
| What astronomer is credited with discovering the planet Uranus? | â–¶ William Herschel |
| Who used the name Mars to call their god of war? | â–¶ Ancient Romans |
| What famous astronomer was the first person to observe the planet Mercury in detail? | â–¶ Galileo Galilei |
| Who is known for discovering the three largest moons of Saturn? | â–¶ Giovanni Domenico Cassini |
| What astronomer is known for discovering the asteroid Ceres, which was once classified as a planet? | â–¶ Giuseppe Piazzi |
| Who discovered the planet Neptune? | â–¶ Urbain Le Verrier |
| What astronomer was the first to observe the planet Uranus and suggest that it was a new planet? | â–¶ William Herschel |
| Who is credited with discovering the first exoplanet? | â–¶ Alex Wolszczan |
| What astronomer is known for discovering the dwarf planet Haumea? | â–¶ Jose Luis Ortiz Moreno |
| Who discovered the planet Venus? | â–¶ Ancient astronomers |
| What astronomer is credited with discovering the planet Neptune? | â–¶ Urbain Le Verrier |
| Who is known for discovering the four largest moons of Saturn? | â–¶ Giovanni Domenico Cassini |
| What astronomer is known for discovering the dwarf planet Makemake? | â–¶ Michael E. Brown |
| Who discovered the planet Jupiter? | â–¶ Galileo Galilei |
| What famous astronomer was the first person to observe the planet Mars in detail? | â–¶ Johannes Kepler |
| Who is credited with discovering the dwarf planet Eris? | â–¶ Mike Brown |
| What astronomer first theorized the existence of the planet Pluto? | â–¶ Percival Lowell |
| The god of Roman mythology often related to harvest is named after what planet? | â–¶ Saturn |
About the Author
Tim majored in Humanities with a bachelor in English and Theatre at New York State University. He lectured on entertainment business studies for three years at Plymouth College.
Tim has been a trivia host in his current hometown of Pittsburgh for the past two years. He enjoys hanging out with people who love trivia just as much as he does.
His friends call him the Question Master.
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