Across
- 3. made of billions of galaxies
- 4. the thing inside the universe that consists of stars, space, solar systems, dark energy, and many other things
- 5. What galaxy do we live in
- 7. billion years ago when did the universe begin
Down
- 1. Who discovered the thought of the universe
- 2. How many universes are there
- 6. The theory says that our universe may not be the only one to exist, and there could be one to tons of more universes out there