The world of space(:

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Across
  1. 1. A _______ is a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
  2. 4. A ________ is a meteor that survives its passage through the earths atmosphere
  3. 7. The sun is ___________ miles away from the earth
  4. 8. The ________ has 8 planets and 1 star
  5. 11. A large collection of stars is called a ________
  6. 12. A _______ is a cloud of gas and dust in outer space
  7. 16. You look through a _________ to see stars
  8. 17. ________ makes things fall towards the earth
  9. 18. A _________ is a solid piece of debris from an object such as a comet asteroid or meteoroid
  10. 20. The galaxy that we live in is called the ________
  11. 21. _______ is a moon of jupiter,the first two letters are eu
  12. 22. A __________ is a rock that orbits the sun
Down
  1. 2. _________ is a branch in space science,it explains the birth,life and death of stars,planets,galaxies,and other objects in the universe
  2. 3. A _______ is where you can go and see images stars in a domed shaped ceiling
  3. 5. A _________ is a biological community of interacting organisms and their physical environment
  4. 6. _________ is the meaning to figure out something
  5. 9. An _________ is an expert on astronomy
  6. 10. _________ is were you train to be an Astronaut
  7. 13. The ________ is how the universe started
  8. 14. A _______ is consisting of ice and dust,and when near the sun a tail of gas is behind it
  9. 15. A ________ is a region of space having a gravitational field so intense that nothing can escape
  10. 19. _________ is 75% mass of the universe and it starts with the letter h