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Extra-galactic nebulae
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Edwin Hubble
Edwin Powell Hubble was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. Hubble proved that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. He used the strong direct relationship between a classical Cepheid variable's luminosity and pulsation period for scaling galactic and extragalactic distances.
Biography from Wikipedia, CC BY-SA 4.0. Portrait: via Wikipedia (see source).
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