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The American astronomer Edwin Powell Hubble (1889-1953) seen in front of the 2.5m telescope at Mount Wilson Observatory. By using this telescope Hubble improved our understanding of the structure of the universe. In 1923 he obtained a distance of 900,000 light years for the Andromeda galaxy, proving for the first time that the spiral nebulae were laying well beyond our own galaxy. In 1929 he measured the recessional velocities of 18 galaxies and discovered that these velocities increased in proportion to their distance from the Earth; this relationship is now known as Hubble's law. This work gave the first direct evidence of an expanding universe.
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