Question

When astronomers observe the spectra of distant galaxies, they notice that the hydrogen emission lines are shifted noticeably toward the red end of the visual spectrum, a phenomenon called red shift. Red is the lowest frequency of visible light. What does red shift indicate about the movement of the distant galaxies?
They are moving away fro us at high speed.
They are moving towards us at high speed.
They are moving in the same direction as we are.
They are motionless, while we are moving toward them at high speed.

Answer 1

A; They are moving away from us at high speed.