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| Refers to the concept that galaxies are moving away from us and that the farther away they are, the faster they are moving |
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| The shift of the spectral lines toward the red end of the visible spectrum when light from stars or galaxies is examined through a spectroscope |
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| The current theory that describes the beginning of the universe; at time zero, all the matter and energy in the universe were packed together into one immeasurbaly dense, hot mass, and exploded. |
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| The distance that light travels in one year: 9.5 X 10^12 km. |
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| The apparent motion of a star against the background of more distant stars; used to measure the distances to and between stars |
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| An imaginary line from which the distance to an object is measured; the length of the baseline is known |
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| Object either of known brightness or predictable behaviour that astronomers can use to determine distance |
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| Refers to the actual amount of light a star gives off, recorded at a standard distance |
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| The brightness of a star as it appears in the night sky |
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| The process whereby hydrogen nuclei fuse to form helium nuclei with a small loss of mass and a huge release of energy |
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