Which statement describes redshifts?
Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a shorter wavelength.
Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.
Redshifts occur when the light source and observer move closer together, and the light observed shifts to a shorter wavelength.
Redshifts occur when the light source and observer move closer together, and the light observed shifts to a longer wavelength.

B. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

Explanation:

Redshift is a phenomenon where electromagnetic radiation from an object undergoes an increase in wavelength such that the light seems to be shifted towards the red part of the spectrum.  Redshifts are used to track the rotation of our galaxy by the astronomers. Redshifts occur when the light source and observer move farther apart, and the light observed shifts to a longer wavelength.

it has to be b, about 97 percent.

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