The first astronomer to show that spiral nebulae (today called spiral galaxies) have large Doppler shifts was
A) Edwin Hubble
B) Vesto Slipher
C) Percival Lowell
D) Christian Doppler
E) Harlow Shapley

Question

Quizplus · Accepted Answer

Vesto Slipher, an American astronomer, was the first to discover that spiral nebulae have large Doppler shifts, indicating that they are moving away from us at high velocities. This was a key piece of evidence in developing the understanding that the universe is expanding.

The First Astronomer to Show That Spiral Nebulae (Today Called