| 1. |
The nearest star to Earth and the center of the Solar System.
Sun |
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| 2. |
a. This planet's axis is almost parallel to the ecliptic.
b. This planet has eleven known rings, all of which are very faint.
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| 3. |
The warming of an atmosphere that is the result of gases such as carbon dioxide which prevent the sun's heat from escaping.
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| 4. |
a. Four of the moons of this planet are Io, Europa, Ganymede, and Callisto.
b. The Great Red Spot is a distinct feature that can be seen on this planet.
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| 5. |
a. In Roman mythology, this planet is named after the god of war.
b. This planet is also known as the Red Planet.
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| 6. |
How heavy an object is relative to its size; the ratio of mass to volume.
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| 7. |
The degree of heat or cold of a body or an environment.
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| 8. |
Any of thousands of celestial bodies with diameters between one and five hundred miles that revolve around the sun in orbits located mostly between those of Jupiter and Mars.
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| 9. |
a. The only planet where life is known to exist.
b. The densest planet in the Solar System.
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| 10. |
The point in the orbit of a planet or other body at which it comes closest to the sun.
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| 11. |
The act of turning on, or around, an axis. On Earth, this is equal to 23 hours, 56 minutes, and 4 seconds.
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| 12. |
a. The smallest planet in the Solar System.
b. This planet has not yet been visited by any spacecraft.
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| 13. |
A relatively small, icy celestial body with a long tail of light that revolves around the sun.
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| 14. |
A very large group of stars and planets that includes the Sun and its solar system.
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| 15. |
One complete circular movement made by one object around another object.
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| 16. |
The sun and the celestial bodies that orbit the sun, including planets, satellites, asteroids, comets, dust, and gas.
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| 17. |
The mixture of gases that surrounds a planet.
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| 18. |
The nine major celestial bodies that orbits the sun.
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| 19. |
(2 Words) Jupiter, Saturn, Uranus, and Neptune.
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| 20. |
(2 Words) Mercury, Venus, Earth, and Mars.
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| 21. |
A piece of rock or metal from space that enters the earth's atmosphere at high speed and burns up.
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| 22. |
a. The fastest moving planet in the Solar System.
b. This planet is named after the messenger of the gods (from Roman mythology).
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