Space crossword

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Across
  1. 1. the extremely dense cooling core left behind by a dying low to medium mass star.
  2. 3. a region in space where the pull of gravity is so intense that nothing can escape.
  3. 5. the leading scientific explanation for the origin that nothing can escape.
  4. 6. the fundamental building block of all matter in the universe.
  5. 8. the colossal , highly luminous explosion of a star.
  6. 9. a bowl shaped depression or cavity in a surface typically caused by a volcanic eruption.
Down
  1. 2. any small relatively dim star or the dead remnant of a star.
  2. 4. the total disaster a beam of light travels through a vacuum in one earth year.
  3. 7. an icy small celestial body that orbits the sun.
  4. 8. the sixth planet from the sun and the second largest in our solar system.