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| Astronomy is one of the oldest sciences. Records dating back to 2000 BC show that ancient people had a calendar based upon the movements of the sun and the moon. Most ancient people believed that earth was flat, with the stars forming a tentlike cover over the earth. LIFE CYCLE OF STARS: Stars are not alive, but they all have a life cycle. The life cycle of a star takes billions of years. As time passes, a star changes its mass into energy. The energy is given off as light and heat. A stars mass cannot last forever. In time, most of the mass is used up and the star dies. COMPLETE THE FOLLOWING: 1. A star changes ________ into energy. 2. Stars give off energy as light and _______. 3. A proto star forms in a _____. 4. The ________ stage is the longest in a star's life cycle. |
| Life Cycle of a Star |
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