Gwen's Crossword

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Across
  1. 2. Massive stars become these.
  2. 3. what remains when a supergiant star collapses into itself.
  3. 7. The final stage of more massive stars is collapse and then an explosion
  4. 8. the type of reaction the sun and stars have.
Down
  1. 1. a cloud of gas and dust.
  2. 2. occurs when Earth's shadow falls on the Moon.
  3. 4. white dwarf cools for eons until it is too old to emit light.
  4. 5. The hot center of a nebula
  5. 6. occurs when Earth's shadow falls on the Moon.