GFHS Stars
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26 terms
Terms | Definitions |
|---|---|
 absolute magnitude | brightness of an object when compared to others the same distance away |
| black hole | object with strong gravity from which nothing can escape |
| H-R diagram | graph used to organize stars according to surface temperature and absolute magnitude |
| main sequence | location on the H-R diagram where most stars are located |
| nebula | a cloud of gas and dust - birthplace for stars |
| radio telescope | a telescope that picks up radio waves given off in space |
| reflecting telescope | telescope that uses two mirrors and a concave lens |
| refracting telescrope | telescope that uses two convex lenses and bends the light |
| spectroscope | used to identify a star by separating starlight into the colors of its elements |
| galaxy | collection of stars, nebulae, gases, dust, and planets that move as a unit |
| constellations | star patterns |
| light-year | the distance that light travels in one year |
| electromagnetic spectrum | all types of electromagnetic wave energy as a group |
| ROY G BIV | Colors of visible light from longest to shortest wavelength |
| seasonal constellation | constellations visible for only part of the year |
| circumpolar constellation | constellations that are visible throughout the year |
| astronomical unit | the distance from the earth to the sun |
| red shift | the moving away of objects in space |
| apparent magnitude | Number that is used to compare brightness of stars. How much light it emits and how close it is to earth |
| luminosity | energy output from the surface of a star per second, measured in watts |
| binary star | two stars gravitationally bound together |
| blue shift | stars moving toward the observer |
| Doppler Effect | change in wave frequency that occurs in energy when that energy moves toward or away from an observer |
| parallax | apparent change in the position of an object caused by a change in position of the observer |
| universe | all the matter and energy that exists |
| variable star | giants that pulsate inbrightness because of expansion and contraction of their outer layers |
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