Across
- 4. A group of planets in orbit around a star
- 5. Anything with mass that takes up space
- 8. The universe is made of clusters of ________
Down
- 1. When matter in a universe move farther and farther away from each other
- 2. A force exerted by all matter that pulls other matter toward it
- 3. Background Radiation Thermal heat energy left over from the Big Bang that is distributed all over the universe and can be found in all directions
- 6. A theory about the origins of the universe that states all matter exploded from a single compressed point 13.7 billion years ago
- 7. The study of the universe, how it began, it’s current state, and it’s future