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Category:	Science
Word Count:	305
Featured Papers from Direct Essays 1. the universe 2 2. stars and the universe 3. The Big Bang and Supernovas 4. Once upon a time in a galaxy far, far away 5. QPO

	red shift
	Red shift - Is an apparent increase of the wavelength of light toward the red end of the electromagnetic spectrum caused by relative motion between the light-emitting object and an observer. - The red shift of light occurs due to relative velocities of source and observer, cosmological expansion, and gravity. - It is an instance of the Doppler effect, which is defined as when waves emitted by a stationary object spread out evenly in all directions, with the same wavelength - Red shift can

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red shift