Space and Space Exploration

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Across
  1. 1. Weight is an example of this
  2. 3. The unit that weight is measured in
  3. 4. The main gas needed to support life
  4. 7. What all masses do to each other
  5. 8. The gravitational pull on an object
  6. 10. Reaches from the Earth's surface to 100 km above the Earth
  7. 11. The unit that mass is measured in
  8. 12. The state of water needed to support life
  9. 13. The region between astronomical objects such as planets, moons and stars and is almost a perfect vacuum
Down
  1. 2. An organism that can live in extreme conditions such as high temperature or low oxygen levels
  2. 5. Also needed to support life
  3. 6. The amount of matter in a substance
  4. 9. A suitable one of these is needed to support life