Space Crossword

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Across
  1. 2. Hottest planet
  2. 4. Leftover formations of stars or planets, chunks of rock and ice, when close enough to the Sun, has a gaseous trail behind it
  3. 7. Organization that conducts experiments, researches about space
  4. 8. Small rocks floating in space (remains of planets), not big enough to be called planets
  5. 9. Point directly above your head
  6. 10. A small object orbiting a larger one
  7. 11. Composed of 30% forest, 70% ocean
  8. 12. A sudden violent burst of energy
  9. 14. Period between new moons
  10. 15. Planet bright red in colour
  11. 16. Theory that the universe expanded quickly after the Big Bang
  12. 17. Has visible rings, pale yellow
  13. 19. Group of stars, gas and dust held together by gravity
Down
  1. 1. Compactness of matter
  2. 3. Gas giant, biggest planet
  3. 4. When asteroids hit the Moon and form visible "holes"
  4. 5. Amount of time it takes for the Earth to spin once on its axis
  5. 6. A group of stars named by astronomers because of how they look
  6. 13. Blue, icy planet
  7. 18. Apparent change in the shape of the Moon, Mercury or Venus depending on how much of the sunlit side is facing your direction (Earth)