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