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By the time Einstein had become world-famous, a young ex-lawyer returning from the First World War started work at the 15 Mount Wilson Observatory in California. Using the most high-powered telescope of its time, he began a painstakingly slow observation of nebulae, small patches of light that appeared outside our galaxy. Edwin Hubble was on the brink of making the greatest astronomical breakthrough of the century. He discovered that these nebulae were in fact galaxies like our own, millions of light years away from us, which proved that the universe was vastly larger than had previously been thought. Then, Hubble proved that the universe is actually expanding and that the further away galaxies are the faster they move.
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