Astronomy

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Across
  1. 3. Discovered the first object orbiting other planets
  2. 6. Inner 4 planets
  3. 9. Everything in space
  4. 11. Rock body that revolves around the sun
  5. 13. Distance from the Sun to Earth
  6. 15. The process that combines elements
  7. 16. Measuring distances to other stars based on geometry
Down
  1. 1. First telescope
  2. 2. First man made satellite in orbit
  3. 4. Distance light travels in a year
  4. 5. Most stars are in this stage
  5. 7. Manned missions to orbit Earth
  6. 8. The way we can tell object moving away from us
  7. 10. An exploding star
  8. 11. Missions that took astronauts to the moon
  9. 12. Collections of stars held together by gravity
  10. 14. Cloud of gas and dust from which stars form