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Across
  1. 4. 1572 shares the same brightness as venus
  2. 5. made of helium and hydrogen
  3. 7. types of supernovas
  4. 9. new star
Down
  1. 1. cygni brightest nova
  2. 2. dwarf stars left behind stellar core
  3. 3. produces more energy than the sun
  4. 6. part of the black hole family
  5. 8. nebulae founded in 1779
  6. 10. holes over a million of them in the galaxy