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Astronomy Basics
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Astronomy Basics
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4 Questions

1. Large group of stars - dust - and gas held together by gravity; can be elliptical - spiral - or irregular

2. The theory that the universe originated 20 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature

3. The average distance between the Earth and the sun - or approximately 150000000 km

4. The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon

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