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| apparant change in position of object due to change in location of observer |
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| planet seems to go backward because earth passes it |
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Carefully studied planets for 20 years
created observational tables & made huge instruments |
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Brahe's student
discovered elliptical orbits of planets |
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forces and waves have the square value of weakness with any certain area
e.g. if light has to cover 3x the area, it will be 9x dimmer. |
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| general theory of relativity |
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| there is no difference between gravity and acceleration |
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| way to describe action @ a distance |
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| # of waves that pass a point in 1 second |
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| distance between peaks of wave |
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| colors focus at different point lengths, because of lens |
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| ability to reveal detail of image |
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charge-coupled device
computer chip with light detectors |
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| piece of glass with many tiny parallel grooves in surface |
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| super energetic subatomic particles traveling through space |
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| average speed of particles |
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| when atom changes # of electrons |
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| Atom that changed its # of electrons |
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| electron orbit; very particular amount of energy that electrons can have |
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| this has electron moved to higher energy level |
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| when excited solid, liquid, or dense gas emits light |
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| when light passes through cool, low-densiy gas |
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| when excited, low-density gas emits light, at particular wavelengths |
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when atoms of gas absorb photons of certain wavelengths
makes there be black lines in a continuous spectrum |
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| when excited atoms emit photons of certain wavelengths |
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| apparent change in wavelength caused by motion of the source |
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| when light source moves away, wavelength stretches out |
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| distance from lens/mirror to image of distant light source |
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| Solar eclipse needs a _____ moon. |
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| Lunar eclipse needs a _____ moon. |
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| determined by location of poles (not by non-tilted directions) |
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| secondary mirror reflects light down through hole in the objective mirror |
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