Dark Matter/Energy Crossword

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Across
  1. 5. Effects of Gravity
  2. 8. Rate of speeding up
  3. 11. Discover about a topic
  4. 12. Unseen elements
Down
  1. 1. Matter we don't understand
  2. 2. Alert to something
  3. 3. What the Universe does
  4. 4. Matter we know
  5. 6. Energy we don't understand
  6. 7. Holds everything together
  7. 9. Combination of Solar Systems
  8. 10. Everything in existence