Portrait of Edwin Hubble Courtesy of the Archives, California Institute of Technology

Edwin Hubble was an American astronomer who lived between 1889-1953. He spent a lot of time looking at groups of stars and planets, called galaxies, and trying to explain their motion. He found that all other galaxies are moving away from the Milky Way, our own galaxy.

The Hubble space telescope, recently sent into space, is named after him.