- published: 19 Nov 2010
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A blueshift is any decrease in wavelength (increase in frequency); the opposite effect is referred to as redshift. In visible light, this shifts the colour from the red end of the spectrum to the blue end. The term also applies when photons outside the visible spectrum (e.g. x-rays and radio waves) are shifted toward shorter wavelengths, as well as to shifts in the de Broglie wavelength of particles. Blueshift is most commonly caused by relative motion toward the observer, described by the Doppler effect. An observer in a gravity well will also see infalling radiation gravitationally blueshifted, described by General Relativity in the same way as gravitational redshift. In a contracting universe, cosmological blueshift would be observed; the expanding universe gives a cosmological redshift, and the expansion is observed to be accelerating.
Doppler blueshift is caused by movement of a source toward the observer. The term applies to any decrease in wavelength (increase in frequency) caused by relative motion, even outside the visible spectrum. Only objects moving at near-relativistic speeds toward the observer are noticeably bluer to the naked eye, but the wavelength of any reflected or emitted photon or other particle is shortened in the direction of travel.
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peer through the cracked stained glass closely observe
open up your mouth follow it down you'll never learn go
witch-hunt your friends go shed skin blue shift the blame
all i want we just can't get and i believe there's
nothing missing say goodbye to your insides your silence
speaks loud is this not how you wanted things is this the
sound inside your doubt dragged down by all that you said
you would be now dragged down in time dragged down
tonight peer straight through the cracked stained glass
closely observe open up your mouth follow it down you'll
never learn go witch-hunt your friends go shed skin blue
shift the blame all i want we just can't get and i
believe there's nothing missing goodbye inside you're
hollowed out and broken two by four five in the morning
let's hear what you have to say you're pushing for a
reaction but you hold no weight and jealous hands feed