Astronomy Terms

3. the magnitude of a celestial object as it's measured on earth
8. the displacement of spectral lines toward longer wavelengths
10. the range of wavelengths over which electromagnetic radiation extends
11. and increase or decrease in the frequency of sound, light, or other waves
12. a system of millions or billions of stars, along with dust and gas, held together by gravity
13. a fixed luminous point in the night sky
16. a series of star types which most stars belong
17. the intrinsic brightness of a celestial object

1. how astronomers explain the forming of the universe
2. the displacement of the spectrum to shorter wavelengths
4. a graph in which the absolute magnitudes of stars are plotted against their spectral types
5. the magnitudde of a celestial object as seen from a distance of 10 parsecs
6. all existing matter and space considered as a whole
7. a celestial body consisting of ice and dust that forms a "tail" of gas and dust particles when near the sun
9. a cloud of dust and gas in outer space, visible in the night sky as a bright patch, or a dark silhouette
14. a small rocky body orbiting the sun
15. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass