Space

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Across
  1. 1. What do we call the stuff in space that we definitely understand?
  2. 5. planets and black holes?
  3. 7. Who came up with the Big Bang idea?
  4. 8. What does dark matter not reflect, absorb, or emit?
Down
  1. 2. What do we call a scientific idea?
  2. 3. What is invisible for us to see?
  3. 4. What came together to make stars,galaxies and eventually
  4. 6. Did the Big Bang happen 13 million or thousand years ago?