<span>According to the Doppler effect, objects moving away from Earth would have a redshift. </span>A <span> redshift means that every wavelength becomes longer and if we observe Hydrogen lines that are at a certain position, those will become redshifted.</span>
I think it is C. cross-site scripting
The answer to this is C :D
Answer:
A and D could work
Explanation:
they do basically does the same thing!!