| Term | Definition |
|---|
| electromagnetic radiation | energy that can travel directly through space in the form of waves |
| wavelength | the distance between the crest of one wave and the crest of the next |
| spectrum | all the forms of possible electromagnetic energy arranged from longest wave length to shortest wavelength |
| optical telescope | refracting telescope and reflecting telescope |
| refracting telescope | uses 2 convex lenses |
| relecting telescope | usses mirrors and an eye piece |
| other telscopes | arecibo radio telescopes, very large array telescope, chandra x ray observatory, spitzer space telescop |
| types of electromagnetic radiation | radio, IR, visible light, UV, x-rays, gamma |
| compare and contrast reflecting and refracting telescopes | reflecting has mirrors and refracting has 2 convex lenses |
| telescopes on earth instead of space | telescopes on earth have to get through the atmosphere so then the picture is blurry, space telescopes dont |
| spectrograph | instruments that break the light from an object into colors and photographs the resulting visible light |
| speed of light | 300,000 km a second, 186,000 miles per second |
| light year | the distance light travels in one year |
| parallax | the apparent change in position or "shift" of an object when you look at it from different places |
| apparent brightness | a stars brightness as seen from earth |
| absolute brightness | the brightness a star would have if it were a standard distance from earth |
| main sequence | 90 percent of stars are on it |
| nuclear fusion | when hydrogen atoms join together to form helium releasing energy |
| absorption specctra | ovvurs when elements in the atmosphere of a star absorb specific energies of visible light |
| classification of stars | color, brightness, temerature, composition |
| hr diagram | shorter life= bigger star, longer life= smaller star |
| pulsar | rapidly spinning neutron star that gives off radio waves |
| nebula | gas and dust in the nebula contracts due to gravity |
| red giant/ super giant | red giant is a low mass star, super giant is a high mass star |
| supernova | when a high mass;/ super giant explodes |
| blackhole | remains of a super nova no electromagnetic radiation can escape |
| neutron star | remains of a supernova if the star doesnt turn into a black hole |
| white dwarf | remaining blue/white core cools |
| black dwarf | the core of the star stops glowing |
| planetary nebula | glowing clouds of gas |
| stellar evolution | nebula, high mass= high mass protostar, high mass star, super giant, supernova, black hole or neutron star |
| low mass | nebula, low mass protostar, low mass star, red giant, planetary nebula white dwarf, black dwarf |
| detecting black holes | revolving gas around black hole being pulled in, effet on nearby stars |
Combine with other sets
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