5 ATHENA ch 16 Scott Foresman 2008
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| terms |  |
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| definitions | |
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| light-year | the distance light travels in one year |
| nebula | a cloud of gas and dust in which new stars form |
| supernova | a gigantic explosion that occurs near the end of the life of some stars |
| black hole | a point in space that has such a strong force of gravity that nothing within a certain distance of it can escape |
| galaxy | a huge system of stars, dust, and gas held together by gravity |
| constellation | a group of stars that forms a pattern |
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