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Velocity Of light?

LIGHT BEAM IS MADE OF PHOTONS, THEN WHY THE VELOCITY OF LIGHT NOT DECREASE WITH PASSING THROW SPACE??
Question asked by: damanmehta

Asked on: 24 Mar 2010

A light beam is indeed made of photons.

The wavelength of light does get stretched as it moves through space, this is known as redshift, and it is how we find out whether galaxies are receding and the speed they are moving at by measuring their redshift.

The effects are almost negligible though; the reason there are not significant changes is that light has no mass.

By: knowitall
Replied at: 28 Mar 2010
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light  velocity  

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