Astronomy Vocabulary Crossword

12345678910
Across
  1. 3. A physical substance that occupies space
  2. 7. A system of stars held together by gravity
  3. 8. A repulsive force that counteracts gravity
  4. 9. The continuous stretching of space itself
  5. 10. Distant galaxies are moving away faster
Down
  1. 1. Invisible, unknown form of matter
  2. 2. Expansion will make universe cold and empty
  3. 4. All matter will go back to a singularity
  4. 5. An invisible force of attraction
  5. 6. Violent expansion will tear apart matter