Across
- 3. Theory of how the universe started
- 5. Theory that the sun and planets orbit the earth
- 8. About How many years old is the universe
- 10. Theory that states the universe is still expanding
Down
- 1. The universe is still ____, we know this because galaxies are moving away from us
- 2. We discovered the heliocentric model by observing the moons of ____
- 4. Scientists speculate the each galaxy has this in the center
- 6. Made the first accurate calendar, went up to 2012
- 7. All matter was compressed into a small point called a ____
- 9. Theory that the earth and planets orbit the sun, we use this now