Lives Of Stars

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Across
  1. 3. hole gravity so strong that nothing cant escape
  2. 4. early stage of a stars life
  3. 6. large cloud of gas
  4. 7. stars remains of high-mass stars
Down
  1. 1. pulsating radio sources
  2. 2. dwarf blue white core of stars left behind cool
  3. 5. explosion