universe Vocab

3. An apparent shift in the position of an object when viewed from different locations
6. A large cloud of dust and gas in space
8. star a star system with two stars
12. glaxy a galaxy shaped like a round or flattened ball, generally containing only old star.
13. dwarf A small, hot, dim star that is the leftover center of an old star
14. Bang The initial explosion that resulted in the formation and expansion of the universe
15. sequence a diagonal area on an H-R diagram that includes more than 90 percent of all stars
19. matter matter that does not give off electromagnetic radiation but is quite abundant in the universe
20. A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
21. brightness the brightness a star would have if it were at a standard distance from earth
22. radiation energy that travels through space in the form of waves

1. law The observation that the farther away a galaxy is, the faster it is moving away.
2. energy a mysterious force that appears to be causing the expansion of the universe to accelerate
3. A rapidly spinning neutron star that produces radio waves
4. cluster a few thousand loosely packed stars
5. An enormously bright, distant galaxy with a giant black hole at its center
7. diagram a graph relating the surface temperatures and absolute brightness of stars
8. hole An object in space whose gravity is so strong not even light can escape.
9. galaxy a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern
10. star the small, dense remains of a high-mass star after a supernova
11. cluster a large, round, densely-packed grouping of older stars
16. galaxy A galaxy that does not have a regular shape
17. the brilliant explosion of a dying supergiant star
18. brightness the brightness of a star as seen from Earth
23. background radiation The electromagnetic radiation left over from the big bang