Ava's space crossword puzzel

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Across
  1. 2. Which star is the brightest?
  2. 4. Neil Armstrong was the first one of these to step on the moon
  3. 6. The 4th plant from the sun.
  4. 7. 8 of these are in a row which one is the closest?
  5. 8. A force that pulls objects together.
  6. 10. Outer Space doesn't have any of this and is an element that you need to survive.
Down
  1. 1. Also a candy bar this light can be seen in the night sky.
  2. 3. The challenger, Columbia and Discovery were these.
  3. 5. Planets and the sun live here.
  4. 9. This is a big influence in the ocean tides.