Space

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Across
  1. 2. Big explosion that happens when a star dies
  2. 5. Energy that travels through space
  3. 6. A giant cloud of gas and dust in space
  4. 7. Very far away
Down
  1. 1. Distance between two peaks of a wave
  2. 3. Something related to space
  3. 4. Theory about how the universe began (two words)
  4. 5. Something that is very old