What Is the "Cosmological Redshift

question 155

Multiple Choice

What is the "cosmological redshift"?

• A) the stretching of the wavelengths of photons as they travel through expanding space
• B) the stretching of the wavelengths of photons by the Doppler shift because they are emitted by galaxies that are moving away from us
• C) the loss of energy from photons interacting with virtual particles in the vacuum, resulting in the wavelength of the photons gradually increasing as they travel toward us through space
• D) the stretching of the wavelengths of photons as they pass through absorbing matter in galaxies between us and the emitting galaxy

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