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18 Cards in this Set
- Front
- Back
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Rotation |
-the spinning of Earth around its axis |
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Orbit |
-curved path |
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Revolution |
-the movement of Earth around the Sun |
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Lunar Highlands |
-the mountainous areas of the Moon |
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Maria |
-the smooth, dark regions of the Moon |
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Eclipse |
-event that occurs when the Moon moves between the Sun and the Earth, or when the Earth moves between the Sun and the Moon and casts a shadow |
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Tides |
-an alternate rise and fall in sea level |
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Solar System |
-made up of 8 planets and numerous other objects that orbit the Sun |
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Astronomical Unit |
-equals 150 million km, which is the average distance from Earth to the Sun |
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Comet |
-a large body of ice and rock that travels around the sun in an elliptical orbit |
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Meteorites |
-any fragment from space that survived their plunge through the atmosphere and landed on Earth's surface |
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Elliptical Galaxies |
-nearly spherical to oval in space and consist of tightly packed stars |
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Spiral Galaxies |
-consist of a large, flat disk of interstellar gas and dust with arms of stars. |
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Irregular Galaxies |
-have no particular shape or pattern |
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Constellations |
-groups of stars that form patterns in the sky |
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Supernova |
-very bright explosion of the outer part of a supergiant that takes place after its core collapses. |
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Galaxy |
-a group of stars, gas, and dust held together by gravity |
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Light-year |
-the distance light travels in one year-about 9.5 trillion km |
