Stars and Galaxies Vocabulary

3. describes two stars that are bound together by gravity.
4. energy output from the surface of a star per second; measured in watts.
7. arrangement of the different types of light (EMR) ordered according to wavelength.
12. Starlike, very bright, extremely distant objects with emission lines in their spectra.
16. brightness an object would have if it were placed at a distance of 10 parsecs (The true brightness of a star).
18. Star that pulsate in brightness due to its outer layers expanding and contracting.
19. outermost layer of the Sun's atmosphere.
21. hot, condensed object at the center of a nebula that will become a new star when fusion begins.
22. small, extremely dense remnant of a star whose gravity is so immense that not even light can escape.
23. dark spot on the surface, cooler than the surrounding areas.
25. how bright a star appears to be when viewed using only your eyes.
26. group of stars that form a pattern in the sky that resembles an animal, mythological character, or everyday object.
28. lowest layer of the Sun's atmosphere that is also its visible surface.

1. On the H-R diagram, the broad, diagonal band that includes about 90 percent of all stars.
2. large cloud of interstellar gas and dust that where stars are formed.
5. layer of the Sun's atmosphere above the photosphere.
6. graph that relates stellar characteristics—class, mass, temperature, magnitude, diameter, and luminosity.
8. Star with pulsation periods ranging from 1 to 100 days.
9. arc of gas ejected from the chromosphere and rains back to the surface.
10. apparent positional shift of an object caused by the motion of the observer.
11. process in a star's core in which lightweight nuclei combine into heavier nuclei.
13. violent eruption of radiation and particles from the Sun's surface.
14. Spherical region that surrounds the Milky Way's nuclear bulge and disk.
15. massive explosion that occurs when the outer layers of a star are blown off.
17. process by which heavy atomic nuclei split into smaller, lighter nuclei.
20. extremely dense remains of a star that went supernova but wasn't big enough to become a black hole.
24. Very bright, often giant, elliptical galaxy that emits as much or more energy in the form of radio wavelengths as it does wavelengths of visible light.
27. stream of charged particles that flows out from the sun.