Cosmological Redshift..Light Space Time?

Question

The wavelength of light increases as it traverses the expanding universe between its point of emission and its point of detection by the same amount that space has expanded during the crossing time....

so both space and light are moving? expanding?
when i turn the light on in my room, is light and space moving
or only light?

Answer 1

This Raises an Interesting Question, Assuming E=hv Holds In this Situation, Where does the Energy {Go to}/{Come From} In a Doppler Shift?

Answer 2

Yes. Light and space are both moving. But over such a small distance it's much easier to observe the movement of light.

HTH ☺

Doug