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Lesson 1: Unit 5

Observing Matter in Space

TermDefinition
optical telescope a telescope that gathers and focuses light, mainly from the visible part of the electromagnetic spectrum
radio telescope an instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites
electromagnetic spectrum the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies
frequency the number of waves that pass a fixed point in unit time
wavelength the distance between two successive crests or troughs of a wave
Doppler effect the change in wave frequency during the relative motion between a wave source and its observer
red shift the displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects
blue shift the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer
spectrum (light) a representation of an object's light spread into component frequencies
parallax the effect whereby the position or direction of an object appears to differ when viewed from different positions
thermal spectrum a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena.
absorption spectrum a spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands
emission spectrum the spectrum of frequencies of electromagnetic radiation given off due to an atom or molecule making a transition from a high energy state to a lower energy state.
Created by: kimwatson
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