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| the study of objects that lie beyond Earth and the processes by which these objects interact with one another |
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| proposed explanation made on the basis of limited evidence as a starting point for further investigation |
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| a system for writing very large and very small numbers. Also called powers of ten notation |
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| the distance light travels in one year (9.46 x 10^12 kilometers) |
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| (AU) the average distance from the Sun to Earth (150 million kilometers) |
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| a body of significant size that orbits a star but does not produce its own light (it only reflects light) |
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Definition
| a large body that generates its own light |
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