Across
- 2. The _____-Fitzgerald contraction is a contraction in length of a moving body in its direction of motion.
- 3. The cosmic _____ background is the faint, diffuse glow coming from all directions in the sky.
- 6. This principle says that the Universe must be infinite.
- 8. An ______ reference frame in which any body initially at rest will remain at rest indefinitely, or in which a moving body moves in a straight line with constant speed indefinitely.
- 10. The _____ law governs the expansion of the Universe.
- 12. _____ relativity includes E=mc^2, that is based upon the speed of light in a vacuum being constant.
- 14. _____ relativity describes how space and time are affected by the gravitational fields of matter.
Down
- 1. The study of structures and evolution of the Universe.
- 4. The slowing down of time that occurs at speeds approaching that of light, as predicted by the special theory of relativity.
- 5. Dark _____ is material whose presence can be inferred from its effects on the motions of stars and galaxies, but which cannot be seen directly because it emits little or no radiation.
- 7. The proposed origin of the Universe.
- 9. The Hubble _____ is the figure that relates the speed of an object’s recession in the expanding Universe to its distance in the Hubble law.
- 11. Dark _____ is the force proposed to account for the apparent acceleration in the expansion of the Universe.
- 13. The Big _____ is the expected end of the Universe.