Solar System: 17 flashcards
All 17 flashcards from this kit, free and with no sign-up.
1. What is the Solar System?
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The Sun and all the objects that orbit it, including planets, moons, asteroids, and comets.
2. What is the Sun?
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A star at the center of the Solar System that provides light and heat energy.
3. How many planets are in the Solar System?
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Eight planets.
4. List the eight planets in order from the Sun.
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
5. What are the inner planets?
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Mercury, Venus, Earth, and Mars. They are rocky and closer to the Sun.
6. What are the outer planets?
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Jupiter, Saturn, Uranus, and Neptune. They are gas giants (and ice giants) and farther from the Sun.
7. What is a moon?
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A natural satellite that orbits a planet or other body.
8. What is the Moon?
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Earth's only natural satellite. It orbits Earth and reflects sunlight.
9. What causes the phases of the Moon?
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The changing angles of the Moon, Earth, and Sun as the Moon orbits Earth, so we see different portions of its sunlit half.
10. What is an orbit?
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The curved path of an object around a star, planet, or moon due to gravity.
11. What is a planet?
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A large body that orbits a star, is massive enough to be nearly round, and has cleared its orbit of other debris.
12. Which planet is closest to the Sun?
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Mercury.
13. Which planet is known as the Red Planet?
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Mars.
14. Which planet is the largest in the Solar System?
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Jupiter.
15. What is the Sun mainly made of?
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Hydrogen and helium.
16. Why do planets orbit the Sun?
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Because of the Sun's gravitational pull, which keeps them in their paths.
17. What is the difference between a star and a planet?
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A star produces its own light and heat (like the Sun), while a planet does not and shines by reflected light.
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