Astronomy
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| stars that appear to be in groups when viewed from Earth. Stars in constellations are not really close in space | ||
| scientists classify stars by their brightness, color and size | ||
| the star's color depends on its temperature | ||
| the bigger and lighter a star the more light it gives off. It's brightness also depends on its distance from Earth | ||
| stars vary greatly is size | ||
| 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. | ||
| the nearer a star, the less time it takes its light to reach the earth. | ||
| the sun's corona surrounds the earth's surface | ||
| the distance light travels in one year | ||
| a group of billions of stars, dust, and gases in space held together by gravity | ||
| It holds Earth in orbit, affects Earth's tides and provides us with heat and light |