Space Science Puzzle

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Across
  1. 2. The unit that weight is measured in
  2. 8. The force that brings everything down on Earth
  3. 9. Gas that makes up Venus's atmosphere
  4. 10. A name given to a ball of burning gas
  5. 11. Name given to whole of detected space
  6. 12. The word used to describe how much matter makes up an object(it never changes no matter what planet you are on and measured in kg)
Down
  1. 1. Category given to pluto
  2. 3. The unit that mass is measured in
  3. 4. The biggest gas planet in our solar system
  4. 5. The force that is exerted on a planet (measured in N)
  5. 6. Fourth planet from the sun
  6. 7. The hottest planet in our solar system
  7. 8. The process that traps heat in the atmosphere