space rocks

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Across
  1. 2. how heavy something is
  2. 9. the rules of gravity
  3. 10. a small rock orbiting
Down
  1. 1. a collection of galaxys
  2. 3. what pulls us down
  3. 4. guy who studied gravity
  4. 5. circling around something
  5. 6. a spheroid of rock or gas
  6. 7. how much matter inside
  7. 8. dwarf planet