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Best The Solar System trivia quiz questions

Test your knowledge on our solar system with questions about the planets, their moons, and other celestial bodies.

  • Which planet in our solar system has the longest day, taking about 243 Earth days to complete a single rotation?

    Venus

  • What is the name of the mission that will explore Jupiter's moon Europa?

    Europa Clipper

  • Which planet has the Great Dark Spot?

    Neptune

  • What is the name of the region beyond Neptune where many small icy bodies are located?

    Kuiper Belt

  • Which planet has the most extensive ring system in our solar system?

    Saturn

  • Which planet in our solar system has the shortest year?

    Mercury

  • What is the name of the phenomenon that causes the tails of comets to always point away from the Sun?

    Solar wind

  • What is the name of the spacecraft that discovered geysers on one of Saturn's moons, Enceladus?

    Cassini-Huygens

  • What is the name of the largest moon of Pluto?

    Charon

  • What is the name of the only spacecraft to visit Uranus and Neptune?

    Voyager 2

  • What is the name of the spacecraft that studied the surface of Pluto in 2015?

    New Horizons

  • What is the name of the mission that sent a probe to study the sun's corona in 2018?

    Parker Solar Probe

  • What is the name of Jupiter's largest moon?

    Ganymede

  • What is the name of the spacecraft that visited all four gas giant planets in our solar system?

    Voyager 2

  • What is the name of the largest canyon in our solar system, located on Mars?

    Valles Marineris

  • What is the name of the mission that successfully landed a rover on Mars in 2012?

    Curiosity

  • What is the name of the spacecraft that studied the atmosphere of Mars in the 1990s?

    Mars Global Surveyor

  • What is the name of the comet that passed close to Earth in 1986?

    Halley's Comet

  • What is the name of the spacecraft that first visited Saturn?

    Pioneer 11

  • What is the name of the first space shuttle to launch into space?

    Columbia

  • What is the name of the spacecraft that first visited Jupiter?

    Pioneer 10

  • What is the smallest planet in our solar system?

    Mercury

  • Which planet has the longest day in our solar system?

    Venus

  • What is the name of the spacecraft that visited all four gas giants in our solar system?

    Voyager 2

  • What is the name of the spacecraft that studied the surface of the moon in the 1960s?

    Lunar Orbiter

  • What causes the auroras on Jupiter?

    Interaction between its magnetic field and solar wind

  • What is the name of the spacecraft that orbited Mercury in the 2010s?

    Messenger

  • Which planet in our solar system has the longest orbital period around the sun?

    Neptune

  • What is the smallest dwarf planet in our solar system?

    Ceres

  • What is the name of the largest volcano in our solar system?

    Olympus Mons

  • What is the name of the spacecraft that studied the surface of Mars in the 1970s?

    Viking

  • What is the name of the spacecraft that first landed humans on the moon?

    Apollo 11

  • What is the name of the boundary that marks the edge of the Solar System, where the solar wind slows down and merges with interstellar matter?

    Heliopause

  • Which planet has the largest canyon in our solar system?

    Mars

  • What is the name of the probe that flew by Pluto in 2015?

    New Horizons

  • What is the name of the largest volcano on Mars?

    Olympus Mons

  • What is the third closest planet to the sun?

    Earth

  • Which planet has the most moons in our solar system?

    Saturn

  • What is the second planet from the sun?

    Venus

  • What is the coldest planet in our solar system?

    Neptune

  • What is the name of the region beyond the orbit of Neptune where many icy bodies are located?

    Kuiper Belt

  • What is the name of the dwarf planet discovered in 2005, which caused Pluto to be reclassified as a dwarf planet?

    Eris

  • What is the name of the largest moon of Neptune?

    Triton

  • What is the name of the spacecraft that first visited Uranus?

    Voyager 2

  • What is the name of the process that powers the sun?

    Nuclear Fusion

  • Which moon in our solar system is considered to have the highest likelihood of harboring extraterrestrial life due to its subsurface ocean?

    Europa (Jupiter's Moon)

  • Which planet is closest to the sun?

    Mercury

  • Which planet has the lowest density in our solar system?

    Saturn

  • What is the seventh planet from the sun?

    Uranus

  • Which two planets in our solar system do not have any moons?

    Mercury and Venus

  • What is the name of the star at the center of our solar system?

    Sun

  • What is the second closest planet to the sun?

    Venus

  • What is the name of the first spacecraft to visit Pluto?

    New Horizons

  • What is the name of the largest moon of Saturn?

    Titan

  • What is the approximate distance between Earth and Mars at their closest approach?

    54.6 million kilometers

  • What is the name of the spacecraft that studied the atmosphere of Venus in the 1990s?

    Magellan

  • What is the name of the probe that landed on a comet for the first time in history?

    Philae

  • What is the fifth closest planet to the sun?

    Jupiter

  • What is the sixth closest planet to the sun?

    Saturn

  • What is the name of the spacecraft that discovered water ice on Mercury?

    MESSENGER

  • What is the eighth and farthest known planet from the sun?

    Neptune

  • What is the name of the largest impact crater on Mars?

    Hellas Planitia

  • What is the seventh closest planet to the sun?

    Uranus

  • What is the name of the spacecraft that took the first close-up images of Pluto?

    New Horizons

  • Which planet has the second-highest mountain in our solar system?

    Earth

  • What is the eighth planet from the sun?

    Neptune

  • What is the name of the first privately-funded spacecraft to reach orbit?

    SpaceShipOne

  • What is the largest moon in our solar system?

    Ganymede

  • What is the fourth planet from the sun?

    Mars

  • What is the name of the region beyond the Kuiper Belt where many comets originate?

    Oort Cloud

  • What is the largest known object in the Kuiper Belt?

    Eris

  • What is the name of the fifth-largest moon of Saturn?

    Enceladus

  • Which two planets in our solar system have no moons?

    Mercury and Venus

  • What is the name of the process by which the solar system was formed?

    Nebular hypothesis

  • What is the hottest planet in our solar system?

    Venus

  • What is the name of the boundary that separates the solar system from interstellar space?

    Heliopause

  • How many Earth years does it take Neptune to orbit the Sun once?

    165

  • What is the name of the first man to walk on the moon?

    Neil Armstrong

  • What is the name of the largest moon of Uranus?

    Titania

  • What is the name of the spacecraft that first visited Neptune?

    Voyager 2

  • What is the diameter of the largest asteroid in the asteroid belt, Ceres?

    940 km

  • What is the name of the mission that will send humans back to the moon by 2024?

    Artemis

  • What is the name of the mission that successfully landed a rover on Mars in 2021?

    Mars Perseverance

  • What is the fourth closest planet to the sun?

    Mars

  • What is the sixth planet from the sun?

    Saturn

  • Which planet has the strongest magnetic field in our solar system?

    Jupiter

  • What is the fifth planet from the sun?

    Jupiter

  • What is the name of the spacecraft that studied the surface of Titan in the 2000s?

    Huygens
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