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Earth spinning around its axis.
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Earth moves around the Sun in a regular, curved path called this.
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The movement of Earth around the Sun.
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Mountainous areas of the Moon
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smooth, dark regions on the Moon that formed when lava flowed onto the Moon's surface.
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event that occurs when the Moon moves between the Sun and Earth or when Earth moves between the Sun and th Moon and casts a shadow.
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alternate rise and fall of sea level caused by the gravitational attractions of the Moon and Sun.
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a unit of measure equal to the distance from Earth to the Sun or about 150 million km
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large body of ice and rock that orbits the Sun; a comet develops a bright, glowing tail as it nears the Sun.
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Any rock from space that survives its plunge through the atmosphere and lands on Earth's surface.
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The nine planets and numerous other objects that orbit the Sun, all held in place by the Sun's gravity.
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group of stars that forms a pattern in the sky.
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group of stars, gas, and dust held together by gravity.
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About 9.5 trillion km -- the distance that light travvels in one year.
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Very bright explosion of a supergiant that takes places after its core collapses.
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