Across
- 4. middle
- 5. the universe considered as a whole
- 8. a sudden eruption of intense high-energy radiation from the sun’s surface
- 10. the farthest point in an orbit around the earth
- 11. a large, old, luminous star
- 12. pertaining to the lungs
Down
- 1. theory that the universe originated sometime between 10 and 20 million years ago from a cataclysmic explosion
- 2. mind, soul
- 3. cell
- 6. shape, form
- 7. nerve
- 9. the absence of matter