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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Light year |
a unit of astronomical distance
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Galaxy |
system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
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Elliptical Galaxy |
an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile
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Spiral Galaxy |
they are more three-dimensional, without much structure, and their stars are in somewhat random orbits around the center
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Irregular Galaxy |
does not have a distinct regular shape
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Planets |
a celestial body moving in an elliptical orbit around a star
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Moons |
the natural satellite of the earth, visible by reflected light from the sun
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Asteroids |
a small rocky body orbiting the sun
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Comets |
of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun
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Meteoroids |
small body moving in the solar system that would become a meteor if it entered the earth's atmosphere
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