| Term | Definition |
|---|
| constellation | stars that appear to be in groups when viewed from Earth. Stars in constellations are not really close in space |
| properties of stars | scientists classify stars by their brightness, color and size |
| color | the star's color depends on its temperature |
| brightness | the bigger and lighter a star the more light it gives off. It's brightness also depends on its distance from Earth |
| size | stars vary greatly is size |
| stars | stars glow because nuclear reactions deep inside stars change small amounts of matter into gigantic amounts of heat and light. This energy make the stars so hot they glow. |
| star's distance | the nearer a star, the less time it takes its light to reach the earth. |
| corona | the sun's corona surrounds the earth's surface |
| light year | the distance light travels in one year |
| galaxy | a group of billions of stars, dust, and gases in space held together by gravity |
| sun | It holds Earth in orbit, affects Earth's tides and provides us with heat and light |
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