Space

1. Classifications of planets like Jupiter, Saturn, Uranus or Neptune
5. region outside Earth's atmosphere
9. A big chunk of metal and glass orbit ling around Earth
10. The name of the phenomenon where celestial bodies move in an ellipse
11. bright shining object that appears at night
12. A place used for man made operations in space (ex. ISS)
13. A person named Neil Armstrong landed on this thing
16. without it, you will be floating around
17. A theory in quantum physics stating that multiple different realities may exist at once (and was the name of some MARVEL movies)

2. A tool used for viewing outer space from Earth.
3. giant cloud of gas and dust in space
4. The closest star to earth (other than the sun)
6. made of ice, dust, and rocks. And was also the nickname for the Dehavilland DH106
7. Formerly considered the Solar System's 9th planet
8. A person who typically works in space
14. A unit of measurement that's based off the distance light travels in one year (no space)
15. A planet nicknamed the "Red Planet." And Elon Musk's rovers went there
18. A planet nicknamed "Earths Twin"
19. HOME.