Sun and Stars

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Across
  1. 3. holds together stars
  2. 5. atoms collide to form new elements and give off energy during _______ fusion
  3. 7. cloud of gas and dust
Down
  1. 1. the sun fuses ______ to form Helium
  2. 2. the ______ sequence is where stars are going through nuclear fusion
  3. 4. the beginning stages of a star's life
  4. 6. where fusion happens in the sun