Across
- 4. / In this phase of a massive star's life the atmosphere grows while the center shrinks because the star is quickly running out of hydrogen. (Two Words)
- 6. / Average stars go through this phase in which they consist of interstellar dust, helium gas, and plasma.(Two Words)
- 10. / The longest phase that requires large amounts of energy to fuse hydrogen into helium (__ __ stage).
- 13. / An object with such a strong gravitational pull that even light can’t escape. (Two Words)
- 14. / Massive stars have ____ lives than average stars.
- 15. / When a massive star collapses after it uses all of it’s fuel.
Down
- 1. / The carbon core left at the end of an average star's life that can burn for billions of years. (Two Words)
- 2. / This creates the energy that fuels stars. (Nuclear _____)
- 3. / Radiation beams sent out by spinning neutron stars.
- 4. / Both average and massive stars start in this stage in which they begin to form from clouds of dust found throughout most galaxies. (Two Words)
- 5. / One of the factors that determines the brightness of stars having to do with the area between the viewer and the star.
- 7. / Another factor that determines the brightness of stars having to do with the energy the star puts off.
- 8. / One of the possible ways for a star to end it’s life. It’s so dense that a tablespoon on earth would weigh billions of tons on the star. (Two Words)
- 9. / When an average star begins to cool and expand. (Two Words)
- 10. / At least 9 times the size of the sun.
- 11. / Occurs in a extreme explosion at the end of a massive stars life. (Two Words)
- 12. / The phase when a star is surrounded by a large cloud made up of hydrogen, helium, and dust. It only lasts 100,000 years.