Across
- 1. the combination of atomic nuclei inside stars that causes massive releases of electromagnetic and thermal energy
- 5. a word that means life can be sustained on a planet, due to distance from the sun, carbon abundance, and liquid water
Down
- 2. a large cloud of gas and dust and is the first step of solar nebular theory
- 3. a natural element in the universe that is extremely important for life
- 4. The scientist responsible for 3 major laws of planetary motion