Slipher Made the Observation That Galaxies Rotated and Moved Relative

Multiple Choice

Slipher made the observation that galaxies rotated and moved relative to each other. Hubble expanded on this work to show that___________ .

A) galaxies within the Local Group rotate more than other galaxies
B) the relative motion between adjacent galaxies varies
C) galaxies within the Local Group rotate less than other galaxies
D) the rates of rotation varied within galaxies
E) all galaxies except those in the Local Group are moving away from the Milky Way