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