Space crosssword

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Across
  1. 2. A glowing cloud of gas formed when a star sheds its outer layers.(two words)
  2. 4. A huge explosion that happens when a star dies. (one word)
  3. 8. A small, dense star that’s the remains of a star like our Sun. (two words)
  4. 9. A powerful burst of energy from a star's death. (two words)
Down
  1. 1. A bright blue star in the constellation Orion.
  2. 3. the closest star system to our solar system. (two words)
  3. 5. A giant red star in the constellation Orion.
  4. 6. The lightest element,and a major part of stars. (one word)
  5. 7. A famous constellation that looks like a hunter.
  6. 10. A star that is still forming and hasn't fully ignited yet.