May - space and space travel

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Across
  1. 4. what kind if star is the sun? (fill in as all one word - no spaces between the words)
  2. 8. The name of the astronomer who put forward the theory that the planets revolve around the sun. (last name)
  3. 9. The first female engineer at NASA (last name).
  4. 11. The first living being in orbit (a dog).
  5. 16. The most prominent kind of radiation emitted by the sun (over 99%).
  6. 17. Which scientist coined the term "black hole"? (after their existence was predicted by Einstein)
  7. 19. The largest planet in the solar system.
  8. 20. The year of the moon landing. (first men on the moon).
Down
  1. 1. The inventor of rocket fuel.(last name)
  2. 2. The astronomer who defined planetary motion and orbits. (last name)
  3. 3. The gas that makes up over 94% of Saturn.
  4. 5. One of the largest measurements of distance commonly used in reference to space travel(about 3.0857 x 10^16 m)
  5. 6. The largest moon in the solar system (one of Jupiter's moons).
  6. 7. The first woman in space - 1937(last name).
  7. 10. The name of the first mars rover.
  8. 12. The name of the spacecraft that took Neil Armstrong to the moon. (includes the number)
  9. 13. The planet with the weakest gravitational field strength.
  10. 14. what is at the centre of a black hole?
  11. 15. The planet with the longest day (takes the longest to complete a rotation).
  12. 18. How many moons does Jupiter have?