You observe a Balmer series hydrogen absorption line at 720 nm in the
spectrum of a galaxy. In the lab, the line is measured at a wavelength of 656
nm. Which of the following statements is TRUE?
Which answer:
a. the galaxy is moving towards us
b. physics is slightly different in that galaxy than within our own
c. the galaxy is moving away from us
d. we can determine nothing concerning the motion of the galaxy from the
information presented
e. the galaxy's velocity exceeds the speed of light
