Vocabulary Crossword

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Across
  1. 3. The parts of the universe we cannot see
  2. 4. The theory that dark energy will eventually tear apart every atom in the universe
  3. 5. The theory that the universe will expand until temperature and energy become zero
  4. 7. The atoms that make up every visible object in the universe
  5. 9. The invisible substance that tears the universe apart
  6. 10. A theoretical model of the universe that does not change
Down
  1. 1. The way the universe's size is currently changing
  2. 2. All existing matter and space as a whole
  3. 4. The theory that the universe will collapse back into a singularity
  4. 6. The force of attraction between objects with mass
  5. 8. The invisible substance that holds galaxies together
  6. 9. To see (with an instrument)