Across
- 3. was an American astronomer who performed the first measurements of radial velocities for galaxies
- 5. Edwin _ was an American astronomer
- 7. george _ said that earth was created in a gigantic explosion
- 9. thermal radiation left over from the time of recombination in Big Bang cosmology
- 10. the density of matter in the _ universe
Down
- 1. bound system of stars, stellar, remnants, interstellar gas,dust and dark matter
- 2. an alternative to the BigBang model of the evolution of the universe
- 4. term that was used for a hypothetical original substance
- 6. the universe originated billions of years ago in an explosion
- 8. contemplative and rational type of abstract or generalizing thinking