Unit 1 Vocab

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Across
  1. 2. a giant space neighborhood made of stars, planets, and dust all held together by gravity
  2. 4. A theory that the earth started from a tiny dense point and expanded.
  3. 5. the force by which a planet or body draws object to its center
  4. 7. The model where Earth is considered the center of the universe.
Down
  1. 1. The model where the sun is considered the center of the universe.
  2. 3. like a big family in space where the sun is the parent, and all the planets & moons orbit around it
  3. 6. all space, matter, time, and energy