Space

3. named after the swift-footed roman messanger god
5. the first name of an empty region in the universe with very little galxies
6. the home of the largest volcano
8. the only planet that changed from being a planet to a dwarf planet
9. the astromoner who descovered that the Earth isn't the centre of the universe
11. a strangly elongated planet/dwarf planet
13. a high energy stream of light that shoots out of a black hole
14. a mars rover

1. Was dicovered with mathimatics, not stargazing
2. the hottest planet
4. a theory that, if true, could make people travel through time and space very quickly
7. the largest planet in the solar system
10. a thing that houses millions, if not billions of stars
12. 8th planet from the sun