“It’s an important number to know — how many galaxies are there?” Marc Postman of the Space Telescope Science Institute said in a statement Tuesday. “We simply don’t see the light from 2 trillion galaxies.” That was the earlier estimate derived from Hubble Space Telescope observations, but a new study forthcoming in the Astrophysical Journal and co-authored by Postman suggests the total number of galaxies in the universe is probably in the hundreds of billions rather than the trillions. Interestingly, this is closer to an even earlier figure guessing there were around 200 billion galaxies. That was based on Hubble data from the 1990s.
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