Across
- 3. all observed matter, energy, and time
- 5. The stronger the gravity, the more spacetime curves, and the slower time itself proceeds
- 6. point on an orbital path farthest from the Sun
- 11. The model had the universe as a set of nested spheres surrounding the Earth
- 14. model where the Sun is the center of our solar system
Down
- 1. a unit of length, roughly the distance from Earth to the Sun
- 2. point on an orbital path nearest the Sun
- 4. a unit of astronomical distance equivalent to the distance that light travels in one year
- 7. who created the geocentric model of the universe?
- 8. who started the revolution against the geocentric model of the universe?
- 9. only confirmed location of life
- 10. the ratio of the distance between the foci and the length of the major axis
- 12. who's key discovery was that planetary orbits are not circles but instead are a special type of oval called an ellipse?
- 13. dimension that measures the passing of time
- 15. who explained the distance of stars but was never able to come up with an explanation for planetary motion?