set3

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Across
  1. 2. a ring of gas and dust expelled by a dying star
  2. 7. process by which a star converts into helium
  3. 8. air around us is called?
  4. 10. closest star to the earth
Down
  1. 1. phenomenon where light from a distant object is stretched due to expansion of the universe
  2. 3. largest planet in our solar system
  3. 4. the study of the universe as a whole
  4. 5. a sudden burst of energy on the sun's surface
  5. 6. which star is the alpha Ursa minoris
  6. 9. Earth's natural satellite