The Cosmological Redshift in the Light from Distant Galaxies Is

question 178

Multiple Choice

The cosmological redshift in the light from distant galaxies is explained by which of these effects?

• A) A photon's wavelength is a distance and is therefore lengthened by the general expansion of the universe, making the light appear reddened.
• B) The light observed on Earth was Doppler-shifted to longer wavelengths by the motion of the objects (e.g., galaxies) away from Earth.
• C) The light spreads out over larger areas as distance increases according to 1/(distance)², which causes the wavelength to increase in proportion to distance.
• D) The light from more distant galaxies has traveled through the gravitational fields of more galaxies in getting to Earth and is therefore more gravitationally redshifted.

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