Across
- 4. The biggest explosion human eyes has ever seen.
- 7. Our sun is classified as a _________
- 8. This brings the dust and gas together into planets
- 10. What element fuses together with hydrogen to generate energy during the main sequence stage?
- 11. This theory hypothesizes that planets mostly rotate in the same direction
- 12. This is the process stars perform in their cores.
Down
- 1. Atoms of an element with different numbers of neutrons.
- 2. These planets are made mostly of rock and metal
- 3. Radioactive decay of an isotope leads to a formation of a stable________ isotope
- 5. These are the remains after a supernova
- 6. Our Sun is a ________ ______
- 9. One way a star is classified
- 11. A giant cloud of dust and gas in space