Dark Matter

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Across
  1. 4. What do we call matter that is not stars or galaxies?
  2. 7. Recently, scientists have discovered that the expansion of the universe is ____________.
  3. 9. Do we know if dark matter really exists?
  4. 10. Do we know more about dark matter or dark energy?
Down
  1. 1. Many scientists believe dark matter is a combination of ______ matter and undiscovered stuff.
  2. 2. Dark matter has ______.
  3. 3. Dark matter ______ be sensed by astronomers.
  4. 5. Dark matter is known because it affects the ______ of objects around it.
  5. 6. Dark energy could make up more than ____ of the Universe.
  6. 8. What other dark thing is causing the universe expansion to accelerate?