Across
- 4. a star that has not begun fusion
- 7. material clumping together to become larger
- 9. stars cannot fuse this element
- 11. when this happens in the core the star heats up
- 14. theory where a collision forms moon
- 15. a large cloud of gas and dust where stars are born
- 16. fuel source of red giants
Down
- 1. type of star after a small main sequence
- 2. energy radiating from a star per second
- 3. the area around a star where ice can condense
- 5. these types of planets exist closest to a star
- 6. the fuel source of a main sequence star
- 8. baby planets less than 1km in diameter
- 10. what a white dwarf is made of
- 12. a dense star where protons and electrons fuse
- 13. a disk around a star where moons may form