Giant, mature galaxies seem to have filled the universe shortly after the Big Bang, and astronomers are puzzled.
"We had specific expectations for the type of galaxies that live in the early universe: they are young and small," Joel Leja, assistant professor of astronomy and astrophysics at Penn State and one of the authors of the study, told Space.com in an email.
"The most massive galaxies in our sample are estimated to have masses [two to four times lower] than that of our own Milky Way," Leja wrote."This was astounding — we're finding galaxy candidates as massive as our own galaxy when the universe was 3% of its current age."
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