Space

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Across
  1. 2. a cloud of gas and dust that is either an indistinct bright patch or a dark silhouette against other luminous matter
  2. 3. cluster a group of stars which are gravitationally bound
  3. 5. a set of stars
  4. 6. hole an intense gravitational field that now matter or radiation can escape
  5. 7. a system made up of millions or billions of stars
  6. 8. a big explosion resembling the death of an old star
Down
  1. 1. a galaxy that has an irregular shape
  2. 4. an object used to see far-away objects
  3. 9. a spherical chunk of rock or gas