Edwin Hubble

Edwin Hubble was one of the great astronomers of the 20th century. His work made the Universe a bigger place. He proved that the Universe is constantly expanding. Hubble also discovered that ours was not the only galaxy in space. Have you ever heard of the Hubble space telescope? It was named after him. It's one of the first telescopes to orbit the Earth.

Image credits: main image, "Edwin Hubble Discovers the Universe", Mt. Wilson Archive, Carnegie Institution of Washington; "Edwin Hubble Discovers the Universe", Mt. Wilson Archive, Carnegie Institution of Washington.

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The Hubble Space Telescope is the first major optical telescope to orbit Earth.