Across
- 5. ________________ fusion occurs by the triple alpha process.
- 7. A star that is fusing hydrogen in its core is a _______________________star.
- 8. A star that is fusing hydrogen and helium in shells surrounding an inert carbon core.
- 9. Heavier elements in high mass stars are fused by _________________ capture.
- 10. The number of stars in the observable universe is roughly 70 ______________ ____________.
- 11. A ________________ is about 9.5 trillion kilometers.
- 13. A phase in the evolution of medium mass stars that has nothing to do with planets.
- 15. An explosion caused by the collapsing core of a high mass star that doesn’t leave any remnant.
- 17. All low mass stars end their life as a ___________________.
Down
- 1. A stellar remnant left behind by a high mass star of initial mass greater than about 20 solar masses.
- 2. When the core of a high mass star is full of the element _______________, it no longer produces energy.
- 3. A star that is fusing helium in its core is a _______________________ star.
- 4. The process by which stars make new elements is called _____________________.
- 6. An explosion caused by the collapsing core of a high mass star that leaves a stellar remnant.
- 12. A star that is fusing hydrogen in a shell surrounding an inert helium core.
- 13. A stellar remnant detected on Earth as rapid, perfectly spaced bursts of radiation.
- 14. A stellar remnant left behind by a high mass star of initial mass less than about 20 solar masses.
- 16. All low mass stars begin their life as a ___________________.
- 18. _______________ fusion occurs by both the proton-proton chain and the CNO-cycle.