Space

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Across
  1. 4. the envelope of gases surrounding the earth or another planet
  2. 6. the force that attracts a body towards the centre of the earth
  3. 7. a Spaceship
Down
  1. 1. a person who is trained to travel in a spacecraft
  2. 2. a system of millions or billions of stars,held together by gravitational attraction
  3. 3. explosion of stars that marks the end of their lives
  4. 5. the usa measure unit