Crossword on Space

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Across
  1. 3. a vehicle that is used for travel in outer space
  2. 4. the upper layer of the Earth’s atmosphere
  3. 6. a large ball of burning gas in space that produces light and heat
  4. 8. a group of stars that forms a particular shape in the sky and has been given a name
  5. 10. a group of many stars along with gas, dust, and dark matter
  6. 11. all of space and everything in it: including stars, planets, galaxies
  7. 13. the 4th planet from the sun
  8. 14. large objects made of dust and ice that orbit the Sun + known for their long, streaming tails
  9. 16. the scientific study of stars, planets, and other objects in outer space
  10. 18. to send or shoot a rocket into outer space
Down
  1. 1. very large chunks of rock found in space
  2. 2. a person trained to travel into outer space
  3. 5. a bright circle seen around the sun or the moon
  4. 7. the line where the earth or sea seems to meet the sky
  5. 9. traveling through an unfamiliar area in order to learn about it
  6. 12. an object in orbit around a planet
  7. 15. circles the earth once every 28 days
  8. 17. the star that the Earth orbits around