Unit 7 Ch. 29 Stars Vocabulary CW

4. cloud of interstellar gas and dust
5. when only two stars are gravitationally bound together and orbit a common center of mass
6. a stars power
9. how bright a star would appear if it were placed at a distance of 10 pc
11. a pulsating star
12. groups of stars (88 of them)
13. how bright a star appears
15. the splitting of heavy atomic nuclei into smaller, lighter nuclei, like uranium into lead
18. a unit larger than a light year used often by astronomers
19. collapsed, dense core of a star that forms quickly while its outer layers are falling inward, has a radius of about 10km, a mass 1.4 to 3 times that of the Sun, and contains mostly neutrons
21. massive explosion that occurs when the outer layers of a star are blown off

1. in an H-R diagram, the broad, diagonal band that includes about 90 percent of all stars and runs from hot, luminous stars in the upper-left corner to cool, dim stars in the lower right corner
2. dark spots on the surface of the photosphere
3. outside the photosphere which is only visible only during a solar eclipse and when the photosphere is blocked
7. small extremely dense object,its gravity is so immense that nothing, not even light can escape it
8. is the combination of lightweight, atomic nuclei into heavier nuclei, such as hydrogen fusing into helium
10. is an arc of gas that is ejected from the chromosphere, or is gas that condenses in the inner corona and rains back to the surface
14. apparent shift in position caused by the motion of the observer
16. a hot, condensed object at the center of a disk shaped cloud of gas and dust
17. wind of charged particles (ions) that flows throughout the solar system and begin as gas flowing outward from the Sun's corona at high speeds
18. is the visible surface of the Sun
20. outermost layer of the Sun's atmosphere
21. violent eruptions of particles and radiation from the surface of the Sun