The Big Bang

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