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