Across
- 1. Travels in a wave, visible to the eye
- 3. The most accurate space telescope ever used
- 4. One of the three forms of matter, moves and expands freely
- 5. What fills the universe
- 7. Heat detection or "seeing heat"
- 9. A glowing ball of gas in space
- 10. A display of light
Down
- 2. Between stars
- 6. How something starts
- 8. National Aeronautics and Space Administration