When astronomers observe far away galaxies they see the light being redshifted (i.e. the frequency of the observed light waves is lower – more towards the red – than expected). That is an indication that far away galaxies are moving away from us. not moving. moving towards us.

When astronomers observe far away galaxies they see the light being redshifted (i.e. the frequency of the observed light waves is lower – more towards the red – than expected). That is an indication that far away galaxies are moving away from us. not moving. moving towards us.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 20P: A light source recedes from an observer with a speed vS that is small compared with c. (a) Show that...

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Concept explainers

Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.

Question

When astronomers observe far away galaxies they see the light being
redshifted (i.e. the frequency of the observed light waves is lower – more
towards the red – than expected). That is an indication that far away
galaxies are
moving away from us.
not moving.
moving towards us.

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