Dark Matter

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Across
  1. 1. space in which there is no matter
  2. 4. the act of increasing in size or volume or quantity of scope
  3. 6. a prediction based on existing evidence
  4. 7. how compact something is
  5. 9. the branch of astronomy dealing with the history and structure and dynamics of the universe
  6. 10. a collection of star systems
Down
  1. 2. a physicist who studies astronomy
  2. 3. the physical phenomenon of radiating energy in the form of waves or particles
  3. 5. emptiness
  4. 8. an increase in speed