starry, starry night

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Across
  1. 2. A luminous sphere of plasma
  2. 6. A group of stars
Down
  1. 1. Stars are giant balls of_____
  2. 3. The colour of a star indicates the__________ of a star
  3. 4. This holds stars together
  4. 5. Stars______twinkle
  5. 7. As their _____runs out, stars start to cool