Astronomy Foundations

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Across
  1. 1. A collection of planets with a central star
  2. 5. The spinning of an object about its own axis
  3. 6. a collection of stars, planets, bound by gravity
  4. 8. The orbital motion of one body around another
  5. 9. All space, time,matter, and energy in existence
Down
  1. 2. A natural satellite that orbits a planet
  2. 3. The invisible force that pulls masses together
  3. 4. A huge bright object that creates light and heat
  4. 7. A body that orbits a star,sweeping out a clear path