Dark Matter & Dark Energy Vocab Worksheet

12345678910
Across
  1. 2. The opposite of the Big Bang
  2. 3. An invisible, undetected substance
  3. 8. It keeps planets in orbit and causes objects to fall
  4. 9. a huge collection of gas, dust, and stars
  5. 10. Heat death of the universe
Down
  1. 1. any physical substance that has mass
  2. 4. Rate The speed of change increases continuously
  3. 5. Opposite or against something
  4. 6. The totality of space and matter
  5. 7. Something that is difficult to understand, unexplained, or kept secret