Ubiquity of Hubble Flow

 
Hubble velocities as seen in A's frame
 
Boost (blue vector) to B's frame
 
Resultant (red) velocities seen by B
 
Clean up diagram:   B sees the same Hubble law as A

Series of four diagrams to show how everyone sees the same Hubble law.
Click on any figure to see it enlarged.

Figure made for this course.