-Astronomy-

4. the study of everything in the universe outside of earth's atmosphere
7. an atmospheric phenomenon in which undulating waves of coloured lights dance across the sky
10. if you look at the planets, their orbit seems to loop back on themsleves
11. When mispronounced,it creates a meme.
12. the hardest substance in the universe comes from a dwarf planet destroyed by collision with an asteroid.

1. planet until 2006
2. the belt between Mars and Jupiter that is created by Jupiter's gravitational pull.
3. star study
5. [...]'s atmospheric pressure is so low that the blood of any unprotected visitor would boil
6. unknown form of energy that affects the universe on the largest scales
8. this planet's atmosphere is hot enough to melt lead
9. Uranus has 27.
13. if there was extra terrestrial life forms, we'd be the extra terrestrial to them.