Astronomy Crossword

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Across
  1. 1. the combination of atomic nuclei inside stars that causes massive releases of electromagnetic and thermal energy
  2. 5. a word that means life can be sustained on a planet, due to distance from the sun, carbon abundance, and liquid water
Down
  1. 2. a large cloud of gas and dust and is the first step of solar nebular theory
  2. 3. a natural element in the universe that is extremely important for life
  3. 4. The scientist responsible for 3 major laws of planetary motion