The Big Bang

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Across
  1. 2. A unit of measuring temperature.
  2. 3. Quantity of mass per unit volume.
  3. 6. The universe expands so much that temperature drops.
  4. 8. A VERY fast speed.
  5. 10. The required density for matter in order to make it so the universe will no longer expand nor shrink.
  6. 13. Electromagnetic radiation filling the universe that is a residual effect of the big bang.
  7. 14. When the universe reverts to its original state.
  8. 15. Of the same or a similar kind or nature.
Down
  1. 1. From hot to cold.
  2. 4. From a big wavelength to a small wavelength.
  3. 5. The telescope that is in space.
  4. 7. The four needed forces of the universe.
  5. 9. The science of the origin of the universe.
  6. 11. The building blocks of everything.
  7. 12. Seconds to years.