You:1 second ago It's a shift toward the longer red end of the spectrum from all objects viewed in the universe. A similar phenominum occurs with sound when a car or aircraft passes by. It's even noticed and copied by children who will lower their pitch while pretending an airplane races by.
Redshift is said to be a displacement of the spectral lines toward lengthy wavelengths in radiation from distant galaxies and also celestial objects. It occurs when the light seen coming from an object, which is moving away, is relatively increased in the wavelength. Read more at http://en.wikipedia.org/wiki/Redshift.
1 year ago
Last edited at 8:41PM on 7/6/2012
It has to do with light. ROYGBIV shows that when things are moving away from you, it takes a little longer each second for the light to get to you. This causes light from that object to change slightly towards the R direction. The opposite happens when objects are moving toward you.