The two keys to Edwin ... and other tools, Hubble had found and measured 23 other galaxies out to a distance of about 20 million light years. The second key was the work of Vesto Slipher, who ...

According to historical records, we have one man to thank for this: Edwin Hubble ... romanticize Hubble and his discovery of the universe beyond the Milky Way galaxy, but his work really stood ...