Science Vocabulary

2. Any star that has a hot, dense, core which fuses hydrogen into helium
4. The change in wave frequency during the relative motion between a wave source and it observer
5. A collection of gas, dust, and billions of stars and their solar systems, all held together by gravity
7. Small, rocky objects that orbit the sun
10. The magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs
13. A magnitude of a celestial object as it is actually measured from earth
15. The wavelength of the light is stretched, so the light is seen as "shifted" to the red part of the spectrum
17. Graph in which the absolute magnitudes of stars are plotted against their special types

1. The range of wave lengths or frequencies over with electromagnetic radiation extends
3. A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
6. The state of producing or reflecting bright light
8. How astronomers explain the way the universe began
9. Small, icy object that orbits the sun and has a long "tail" of gas
11. The displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer
12. Everything in our existence
14. An enormous cloudy of dust and gas occupying the space between stars and acting as a nursery for new stars
16. Any massive self-luminous celestial body of gas that shines by radiation served from it internal energy sources