A quick lap around the solar system.
Ten stops. No spacesuit required.
Ten questions, with the answers explained. Try them in your head, then open each answer when you're ready.
Play this quiz →QUESTION 1 / 10
Which planet is closest to the Sun?
- Mercury
- Venus
- Earth
- Mars
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Mercury
Mercury has the innermost orbit, completing a trip around the Sun in about 88 Earth days.
QUESTION 2 / 10
Which planet is famous for its broad, bright ring system?
- Venus
- Saturn
- Mercury
- Mars
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Saturn
All four giant planets have rings, but Saturn has the broad, bright set familiar from photographs.
QUESTION 3 / 10
Which moon is the largest in our solar system?
- Phobos
- Titan
- Ganymede
- Europa
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Ganymede
Ganymede orbits Jupiter and is larger in diameter than Mercury.
QUESTION 4 / 10
Which planet is farthest from the Sun among the eight planets?
- Uranus
- Neptune
- Jupiter
- Saturn
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Neptune
Neptune is the eighth planet. Pluto is classified as a dwarf planet.
QUESTION 5 / 10
What is the name of Earth's natural satellite?
- The Moon
- Phobos
- Titan
- Europa
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The Moon
Earth's natural satellite is the Moon. The other names belong to moons of other planets.
QUESTION 6 / 10
What keeps planets in orbit around the Sun?
- Magnetism alone
- Gravity
- Ocean tides
- Air pressure
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Gravity
Gravity pulls planets toward the Sun while their sideways motion keeps them in orbit.
QUESTION 7 / 10
Which of these is a dwarf planet?
- Mercury
- Pluto
- Venus
- Neptune
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Pluto
Pluto is a dwarf planet in the Kuiper Belt beyond Neptune.
QUESTION 8 / 10
Which planet has the Great Red Spot?
- Saturn
- Uranus
- Mars
- Jupiter
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Jupiter
The Great Red Spot is a huge, long-lived storm in Jupiter's atmosphere.
QUESTION 9 / 10
Which planet has a moon called Titan?
- Earth
- Mercury
- Saturn
- Venus
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Saturn
Titan is Saturn's largest moon and has a thick atmosphere.
QUESTION 10 / 10
Which planet do the moons Phobos and Deimos orbit?
- Mars
- Earth
- Neptune
- Jupiter
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Mars
Mars has two small moons, Phobos and Deimos.