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So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but how many galaxies are in the universe?

Mount wilsonUnited statesHeber curtisEmilioe falcoCarl seyfertCharles messierCaroline herschelMargaret gellerEdwin hubbleEvolution labUniversity of washington astronomy departmentInfospace holdingsUniversity of nottinghamMilky wayMany galaxies areHubble space