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science chapter 3
section 1,2
| Term | Meaning |
|---|---|
| constellation | a pattern of stars in the sky |
| visible light | electromagnetic radiation that can be seen with the unaided eye |
| electromagnetic radiation | energy that travels through space in the form of waves |
| wavelength | the distance between the crest of one wave and the crest of the next |
| spectrum | the range of wavelengths of electromagnetic waves |
| refracting telescope | a telescope that uses convex lenses to gtaher large amounts of light and focus it on a small area |
| convex lense | a piece of transparent glass curved so that the middle is thicker than the edges |
| reflecting telescope | it uses a mirior instead of a lenses |
| radio telescope | used to protect raio waves from objects in space |
| observatory | a building that contains one or more telescopes |
| spectrograph | breaks the light from an object into colors and photographs |
| galexy | a giant structure that contains hundreds of billions of stars |
| universe | all of space erything in it and ev |
| light year | the els in one year distance that light trv |
| parallax | the apperant change in position of an object when seen from diferent places |
| giant star | a very larege much larger than the sun |
| apperant magnitude | the brightness of a star as seen from earth |
| absolute magnitude | the brightness of a star as is it were a standar distance from the earth |
| hertz sprung-russel diagram | a graph relating to the temperature and the brightness of a star |
| main sequence | the area of the h.s.r.d. that runs from upper left to lower right and includes more than 90% of all stars |
Created by:
M**M
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