How does the expansion of the universe affect light?

Answer 1

Shifts it toward the color red.

As objects move further away the light waves that are emitted by it are stretched out,, so the wavelength becomes longer. The longer wave lengths in the visible spectrum of light are red. So as the waves are stretched they shift toward the red end of the spectrum.

This is also known as the Doppler effect.

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Answer 2

Audrey Adams

The expansion of the universe causes light from distant objects to experience redshift, stretching the wavelengths and reducing energy.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.