Chapter 25
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Created by:
MrsGreen08 on April 13, 2010
Subjects:
Classes:
Ben Frainklins 8th Graders, Wagner-Holt, follow our God it will help, Science/ Math
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25 terms
Terms | Definitions |
|---|---|
 absolute | The magnitude telling the actual brightness of a star. |
| apparent | The magnitude telling the brightness of a star as viewed from Earth. |
| light-year | The distance light travels in one year. |
| nova | A star that explosively increases in brightness. |
| pulsar | A source of regular radio pulses. |
| big bang | The theory for the origin of the universe. |
| binary star | Two stars revolving around a common center of mass. |
| black hole | A massive star that has collapsed to an area of extreme gravity, such that light cannot escape. |
| nebula | A cloud of dust and gas in space. |
| protostar | A collapsing cloud of gas and dust on its way to becoming a star. |
| neutron star | A star of extremely high density. |
| red giant | A large, cool, bright star. |
| supergiant | A VERY large, VERY bright, cool star. |
| supernova | An exploding star that increases in brightness many thousands of times. |
| white dwarf | A star that has exhausted most of its nuclear fuel and is believed to be near its final stage. |
| parallax | the apparent change in position of a distant object |
| main sequence | a stable star that is undergoing hydrogen fusion |
| Hertzsprung-Russell | a diagram showing the relationship between temperature and absolute magnitude |
| red shift | produced by a light source that is moving away from the observer |
| Hubble's Law | the more distant a galaxy, the faster it is moving away |
| spiral | a galaxy made of young and old stars |
| irregular | a galaxy made of young stars |
| elliptical | a galaxy made of old stars |
| Milky Way | the name of the galaxy our solar system is in |
| galaxy cluster | a group of galaxies held together by gravity |
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