Space

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Across
  1. 5. measure of distance of planets relative to the Sun
  2. 8. day and night are equal in length
  3. 9. Earth-centred solar system
  4. 10. a force pulling you to the centre of the Earth
Down
  1. 1. use to measure stars hight over the horizon
  2. 2. sun-centred solar system
  3. 3. people who travel to space
  4. 4. sun reaching the highest/lowest point in the sky
  5. 6. lack of gravitational force
  6. 7. the universe