Stars

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Across
  1. 2. Element discovered in the Sun before Earth
  2. 6. Used Cepheid variables to find distances
  3. 7. All that is left of a star exploding in 1054
Down
  1. 1. Hot and tiny like Sirius B
  2. 3. A star cluster also called Seven Sisters
  3. 4. A constellation mentioned in the Bible
  4. 5. Double star in the big dipper's handle