Universe

2. The force that pulls matter together, governing the motion of stars and planets)
4. The measure of a star's brightness)
6. A group of stars that form a pattern or picture in the night sky)
9. All of space and everything in it, including time and matter)
12. The process in a star's core where hydrogen atoms combine to form helium)
13. An instrument used to detect and magnify electromagnetic radiation from space)
14. The specific spiral galaxy that contains our solar system)
16. A vast cloud of gas and dust in space where stars are born)

1. An object with gravity so strong that not even light can escape)
3. The diagonal band on the H-R diagram where 90% of stars exist)
5. The distance light travels in one year, used to measure great distances)
7. The brilliant, energetic explosion of a dying supergiant star)
8. The curved, gravitational path of a celestial object around a star or planet)
10. A large collection of stars, gas, and dust held together by gravity)
11. A planet that orbits a star outside of our solar system)
15. The star we orbit)