Space and force

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Across
  1. 2. stars and hot gas
  2. 3. using the sun as a reference point
  3. 4. a force of attraction between objects due to their masses
  4. 8. when gravity is pulling it down and no other forces act on it
  5. 9. a celestial body that is composed of gas and emits light
  6. 10. He stated the sun remains stationary and the planets orbit it
Down
  1. 1. 8 planets that orbit the sun, a dwarf planet and ceres
  2. 5. an object in motion stays in motion
  3. 6. when the planets are farthest from the sun and orbit slowly
  4. 7. I am so massive I collapse on myself