| A | B |
|---|
| constellation | groups of stars given significance by different cultures |
| astronomy | study of stars |
| astrology | psuedoscience that uses stars to predict things |
| protostar | matter that goes into a precedes the formation of a star |
| binary star | a system of two stars that orbit each other |
| red giant | cool giant star |
| planetary nebula | an expanding shell of gas ejected from a low-mass star during its latter stages of its evolution |
| white dwarf | a shrunken core that remains blazing white hot |
| black dwarf | a remnant of star that has become a cold black lump |
| supernova | an exploding star where enormous quantities of matter are emitted |
| neutron star | a small dense star composed of tightly packed neurons |
| black hole | the remains of a giant star that has collapsed in on itself, so dense and such intense gravitation that not even light can escape (within the event horzion) |
| galaxy | a large number of stars (hundreds of millions), together with gas, dust and other materials that is held together by gravity |
| elliptical galaxy | galaxy that contains little gas or dust, has no disk, spiral arms and few bright stars |
| spiral galaxy | Disk shaped galaxy with white hot stars and spiral arms (our galaxy) |
| irregular galaxy | a galaxy that has a chaotic appearance, large clouds of dust and gas and no spiral arms |
| cluster | a grouping of more than one galaxy |
| super cluster | a grouping of enormous number of galaxies |
| Big Bang Theory | A primordial explosion that marked the beginning of space and time |
| thermonuclear fusion | hydrogen is converted into helium and enormous amount of radiant energy and thermal energy is released |
