SPACE

2. a fixed luminous point in the night sky which is a large, remote incandescent body like the sun
5. the magnitude of a celestial object as it is actually measured from the earth
6. a small rocky body orbiting the sun
9. a cloud of interstellar gas and dust
12. the range of wavelengths or frequencies over which electromagnetic radiation extends
13. a series of star types to which most stars belong
14. all existing matter and space considered as a whole; the cosmos
15. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
16. the displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects

1. a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures
3. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
4. a celestial object consisting of a nucleus of ice and dust
5. the magnitude of a of a celestial object as it would be seen at a standard distance of 10 parsecs
7. the change in frequency of a wave for an observer moving relative to its source
8. the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density-compare steady state
10. the intrinsic brightness of a celestial object
11. shift the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer