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10 Cards in this Set
- Front
- Back
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universe |
All the celestial objects we see, and that can be seen, in the sky |
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Solar system |
The system of planets, including Earth, moons, and other objects that orbit the sun; in the illustration shown here, the eight planets are drawn to scale, but the distance between the planets is not drawn to scale |
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galaxy |
A collection of many billions of stars, planets, gas, and dust, held together by gravity, as shown below; Earth is in the Milky Way galaxy |
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star |
A large celestial body made of superheated gases |
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constellation |
A group of stars that seem to form a shape or pattern in the night sky; the little Dipper is an example of a constellation |
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polaris |
It is a star facing the north and it identifies north |
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circumpolar |
A group of stars that seem to form a shape or pattern in the night sky |
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Astronomical unit |
A measurement equal to the distance between Earth and the sun, about 150 million km; abbreviation is A.U. |
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Light year |
A measurement equal to the distance that travels in one year, about 9.5 x 1012 km; abbreviation is ly |
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Speed of light |
299 792 458 m / s |
