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When the ultraviolet light from hot stars in very distant galaxies finally reaches us, it arrives at Earth in what form?

Answer 1

Ultraviolet light from distant objects arrives as the same form of ultraviolet light.

No matter how far it travels through space, light never changes.

Therefore, when ultraviolet light from a far-off galaxy reaches Earth, it will still be ultraviolet light at the same frequency.

This is presuming that the light did not travel through an atom, in which case it would have been absorbed by an electron and reemitted at the transition frequency of the electron.

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Answer 2

Jordan Andrews

The ultraviolet light from hot stars in very distant galaxies arrives at Earth in the form of electromagnetic radiation.

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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.