Directions: Match the best available answer in the second column to the words in the first column. You may use your textbook and notes.
 

1. _____	universe		A.	the color of the youngest, hottest stars (25,000° – 50,000°)
2. _____	galaxy		B.	a group of planets (and their satellites) orbiting a star
3. _____	solar system		C.	a small, dense, dim star, not in the main sequence
4. _____	Milky Way		D.	a star so dense that its atoms collapse, and its electrons merge with its protons, very dim, not in the main sequence
5. _____	light year		E.	the color of middle–aged stars (like our sun, – 6,000°)
6. _____	A.U.		F.	a flat, round or oval galaxy
7. _____	parsec		G.	a dying star that explodes
8. _____	elliptical		H.	a large, extremely bright (but cool) older star, not in the main sequence
9. _____	spiral		I.	a galaxy with no regular shape
10. _____	irregular		J.	a group of millions (or even billions) of stars
11. _____	nebula		K.	the color of older, cooler stars (– 3,000°)
12. _____	blue		L.	the stars, galaxies, dust and everything in space
13. _____	white		M.	– 93,000,000 miles, the distance from the Earth to the Sun, used to measure distances within our solar system
14. _____	yellow		N.	a dying star, so dense that nothing can escape, not even light, not in the main sequence
15. _____	red		O.	stable, “normal” stars, ranging from hot/bright to cool/dim
16. _____	giant/super giant		P.	the color of younger, hotter stars (7,500° – 11,000°)
17. _____	dwarf		Q.	– 6,000,000,000,000 miles, used to measure distances to nearby stars
18. _____	neutron star		R.	the name of our galaxy
19. _____	black hole		S.	a galaxy with arms coming from the center like pinwheel
20. _____	super nova		T.	a cloud of dust and gas, the birthplace/graveyard of stars
21. _____	main–sequence		U.	– 3.26 light years, the distance from the Earth at which a star, when viewed from opposite sides of our orbit, will appear to shift 1 second of arc against the background of stars, used to measure distances to stars