Space

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Across
  1. 3. stars Size of cities
  2. 4. 452 B Also known as Earth 2.0
  3. 7. flare Sudden burst of energy on the surface of the sun
  4. 8. hole Sucks everything in it's way
Down
  1. 1. Planet which is made of the same things the sun is made of
  2. 2. time It warps around a black hole
  3. 5. forth state of matter
  4. 6. Planet humans are terraforming to