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Across
  1. 3. the force of attraction exted by a mass upon other bodies
  2. 4. the name given to a collision between two objects
  3. 8. the name to the system orbiting the sun
  4. 10. the path of the earth around the sun
  5. 11. a measurement of time
  6. 12. our closest star
Down
  1. 1. a collection of billions of stars
  2. 2. a round ball shape is called a sphere
  3. 5. pieces of rock or metal that orbit the sun
  4. 6. a region in space that has such an enormous force of gravity
  5. 7. are satellites of planets
  6. 9. huge spheres of burning gas