The concept of the expanding universe is based on observations of the redshift of light from distant galaxies. Redshift is a phenomenon where the wavelength of light from a receding source is increased (shifted towards the red end of the spectrum).
The concept of expanding universe is based on
Asked in UPPSC Upper Mains 2010 · Topic: Space (Cosmic Microwave Background Radiation (CMBR) and Expansion of the Universe)
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