Halton Arp’s Atlas of Peculiar Galaxies

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Less than one hundred years ago, astronomers were not even sure whether our galaxy made up the entire universe or there were more Milky Ways like ours. Edwin Hubble settled the debate in 1925 when he established that the Andromeda Galaxy was not a cluster of stars and gas within our own galaxy, but an entirely separate galaxy located a vast distance away from the Milky Way. Since then astronomers have discovered thousands of galaxies, but they are also aware that there are potentially hundreds of billions of more galaxies floating out there in the void.

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Source: amusingplanet.com

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