Space

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Across
  1. 3. Powerful burst of energy from the sun's surface
  2. 7. A Black hole in the center of the milkyway
  3. 8. Previous planet that was demoted to dwarf planet
  4. 9. An object orbiting a celestial body
  5. 11. Planets made up of mostly hydrogen and helium
  6. 14. Thing believed to have killed the dinosaurs
  7. 15. The planet within the solar system containing life
  8. 16. Giant cloud of interstellar dust and gas
  9. 18. Phase of the moon when it is completely dark
  10. 19. First country to send anything to space
  11. 20. Number of dwarf planets in the solar system
Down
  1. 1. Fifth planet from the sun
  2. 2. The study of celestial objects
  3. 4. Planet in the solar system orbiting on its side
  4. 5. Measurement of distance in space
  5. 6. A song named after a celestial body that doesn't emit light
  6. 10. One of Saturn's moons containing water
  7. 12. Death of a star
  8. 13. Spaceflight that landed on the moon
  9. 17. continuous stream of charged particles from the sun's superheated outer atmosphere