Across
- 1. Does the temperature decrease or increase the more the universe expands?
- 3. A theory that suggests our universe is always expanding.
- 7. A particle smaller than an atom.
- 8. Leftover radiation from the Big Bang. Oldest microwaves in the universe.
- 9. The name of the man who made the theory of relativity.
- 10. Made up of all matter and space that exist
Down
- 2. The man who discovered galaxies are moving apart from each other.
- 4. Universe was full of them when it began. They helped form the objects in our universe and are what matter is composed from.
- 5. Used to study light
- 6. First two elements on Earth.