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circa 1945: Astronomer Dr. Edwin Powell Hubble (1889 - 1953) sitting in a chair at a desk reading a journal. A staff member at Mt. Wilson Observatory, he was the first scientist to offer observational evidence supporting the theory, now known as Hubble's Law, of the expansion of the universe. (Photo by New York Times Co./Getty Images)

One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate.’ One large Milky Way galaxy or many galaxies? 100 years ago, a young Edwin Hubble settled astronomy’s ‘Great Debate.’

By Chris Impey / The Conversation

Evolution, the process of change, governs life on Earth − and potentially different forms of life in other places.

Extraterrestrial life may look nothing like life on Earth Extraterrestrial life may look nothing like life on Earth

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NASA’s Mars Sample Return mission has a shaky future

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NASA’s Mars Sample Return mission has a shaky future NASA’s Mars Sample Return mission has a shaky future

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Galaxies in outer space.

Why astronomers are blasting Earth’s location to potential intelligent aliens Why astronomers are blasting Earth’s location to potential intelligent aliens

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