Astronomy Vocab Crossword

1. A kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
4. The brightness of a star measured from earth.
8. A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
9. The brightness of a star measured at ten parsecs
10. A graph in which the absolute magnitudes (intrinsic brightness) of stars are plotted against their spectral types (temperatures).
11. The intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance).
17. An increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.

2. A series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left (hot, bright stars) to the lower right (cool, dim stars).
3. That all the distances in the universe are stretching out at the same rate.
5. The displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer.
6. The displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects.
7. A small rocky body orbiting the sun.
12. All existing matter and space considered as a whole; the cosmos.
13. A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
14. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
15. A celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
16. A fixed luminous point in the night sky which is a large, remote incandescent body like the sun.