Unit 8 Vocabulary

2. Brightness of a star compared to the sun.
5. The number of electromagnetic waves traveling past a fixed point in a specific unit of time (usually one second).
8. The remains of a super high mass star after a supernova. Super strong gravity. Light can't even escape.
9. Closest star to earth, main sequence, average mass star.
10. Oval, round, flattened ball. Has NO arms.
11. Cloud of dust and gas. Birth place of all stars.
14. The actual brightness of a star.
16. Pinwheel-shaped, has arms that move out from the center, ex: The Milky Way.
18. The remains of a high mass star after a supernova. Very small star.
22. The brightness of a star as seen from Earth.

1. Is the classification system of temperature used on many HR Diagrams.
3. Galaxy with no definite shape.
4. A diagonal area on an H-R diagram where stars spend 90% of their lifetime.
6. Gravity pulls Hydrogen atoms together and they join creating Helium. Light and heat are released as a result. Causes stars to form and shine.
7. Arrangement of electromagnetic waves according to their wavelengths and frequencies.
12. The distance light travels in 1 year. Approximately 6 trillion miles.
13. Dead star; no longer fusing but is still glowing because it is very hot.
15. A large celestial body of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
17. The explosion of a high mass or super high mass star.
19. Completely dead star; not glowing.
20. A small to average sized star that is beginning to die.
21. The distance between the crest of one wave and the crest of the next wave.