So you think you know space

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Across
  1. 2. a small rock orbiting the sun
  2. 3. a star that appears only during the day
  3. 4. the name of the galaxy we live in
  4. 6. a planet that shares its name with the roman god of the sea
  5. 7. these are mostly made of hydrogen and helium
  6. 9. this is now considered dwarf planet
  7. 12. the 5th planet in out solar system
  8. 13. the planet we live on
  9. 16. has a thick atmosphere made up of methane, hydrogen, and helium
  10. 18. the 6th largest moon of Saturn
Down
  1. 1. an object put into space by human in 1990 it orbits 547 kilometers above earth and it has the length of a school bus
  2. 2. a simplified version of an extraterrestrial
  3. 5. the planet closest too the sun also the smallest since Pluto is no longer considered a planet
  4. 8. a region in space with a gravitational pull so intense not matter or radiation can escape
  5. 10. the hottest planet in our solar system
  6. 11. an unusual ring galaxy in the constellation Serpens Caput
  7. 14. a celestial object consisting of a nucleus and has a tail
  8. 15. the only other planet in our solar system to have some form of water
  9. 17. a planet 9 1\2 times larger than earth considered a gas giant its the 6th planet away from the sun