Space Crossword

5. Organization that conducts experiments, researches about space
6. Group of stars, gas and dust held together by gravity
7. Hottest planet
9. Apparent change in the shape of the Moon, Mercury or Venus depending on how much of the sunlit side is facing your direction (Earth)
10. Blue,icy planet
12. A small object orbiting a larger one
13. Amount of time it takes for the Earth to spin once on its axis
15. A group of stars named by astronomers because of how they look
17. Leftover formations of stars or planets, chunks of rock and ice, when close enough to the Sun, has a gaseous trail behind it
18. Gas giant, biggest planet
19. Period between new moons

1. A sudden violent burst of energy
2. When asteroids hit the Moon and form visible "holes"
3. Planet bright red in colour
4. Composed of 30% forest, 70% ocean
8. Point directly above your head
11. Small rocks floating in space (remains of planets), not big enough to be called planets
13. compactness of matter
14. Theory that the universe expanded quickly after the Big Bang
16. Has visible rings, pale yellow