Breakthrough: The Ideas That Changed the World

Discovering the Big Bang

Clip: Episode 1 | 5m 28s  | Video has closed captioning.

In 1923, Edwin Hubble began the manual process of photographing the Andromeda Nebula. He spent many nights at the Hooker telescope collecting data and discovered that Andromeda was not a cluster of stars in our own galaxy but in fact a separate galaxy.