As Measured from Earth, the Spectrum of the Galaxy NGC

Multiple Choice

As measured from Earth, the spectrum of the galaxy NGC 7512 reveals a receding velocity of about 7,000 km/s.If an observer in that galaxy takes a spectrum of the Milky Way they would
Measure ________.

A) the same 7,000 km/s receding speed
B) only 1,000 km/s, because for that observer the Hubble expansion is a lot slower
C) something that we cannot possibly know, because the known laws of physics apply only within the Milky Way
D) 23,000 km/s, because the speed of light has a different value for that observer
E) no relative motion, because we are in fact measuring Earth's motion about the Sun.