16 terms

Earth Sci: Chapter 20 - telescopes and spectroscopy

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optical telescope
a telescope that uses lenses or mirrors to collect and focus visible light
radio telescope
A telescope used to detect radio waves from objects in space
spectroscope
A device that uses a prism or diffraction grating to separate light into its color components.
visible spectrum
tiny part of electromagnetic spectrum to which our eyes are sensitive
continuous spectrum
A spectrum of light in which there are no gaps, so that each region blends directly into the next
bright line spectrum
called an emission spectrum; light of only certain wavelengths is present
dark line spectrum
called an absorption spectrum; blackened areas of a continuous spectrum represent missing wavelengths that have been absorbed by a filter or gas cloud.
charge coupled device
a dime sized component of a camera into which light enters and is converted into an electronic signal
doppler effect
A change in frequency of sound or electromagnetic waves caused by motion of the source, observer, or both.
red shift
an increase of the wavelength of radiation caused by bodies moving apart from one another (wavelength appears longer)
blue shift
A decrease in the wavelength of radiation emitted by an approaching celestial body (wavelength appears shorter)
interferometry
Process that links separate telescopes so they act as one telescope, producing more detailed images as the distance between them increases.
multiple mirror telescope
telescope with more than one mirror
reflecting telescope
A telescope invented by Issac Newton that uses mirrors to produce a view for the viwer and that eliminates the chromatic aberration that is seen in refracting telescopes
refracting telescope
A telescope used by Galileo that uses a convex lenses to gather and focus light
Schmidt-Cassegrain telescope
a telescope that combines a reflector's optical path with a optical corrector plate to make a compact astronomical instrument that uses simple spherical surfaces
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