He is attributed with defining that galaxies revolve, and
was capable to determine the velocities at which they rotate. Slipher had discover
that most galaxies presented a redshift in
their spectrum,
representing that they were all moving away from us in interstellar, or retreating
(Slipher, 1915). By computing the magnitude of the redshift, he was capable to control
the recessional velocity or
the speediness at which matters were "flying." Slipher had made a clarification from his observations that
put a new standpoint on the universe,
and in reply, he established a standing ovation for his demonstration.
