Life Cycle of a Star

6. All stars start in a ______________ ___________.
10. The core left behind after a supernova.
11. A star is born when the gas and dust from a nebula become so hot that _____ ____ starts.
13. What is the main fuel for a star?
14. The white dwarf eventually runs out of energy, dies and becomes a ______ dwarf.

1. When a low to medium mass star begins to run out of hydrogen and begins to fuse helium it becomes a ____ _______.
2. The blue-white hot core of a small to medium mass star that is left behind cools and becomes a ______ dwarf.
3. Left behind after a supernova, nothing can escape not even light.
4. The outer layers of a red giant continue to drift into space forming a ____________ ___________.
5. How long a star exists depends on a stars _______.
7. A star will spend most of its life as a _____ ________ star.
8. Contracting cloud of gas and dust in a nebula.
9. Explosion of a red supergiant star.
12. Element stars begin to fuse as the hydrogen runs out