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en.wikipedia.org/wiki/Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and ... Many galaxies are thought to have black holes at their active centers. ... galaxy, the Milky Way, to distinguish it from the other galaxies in our universe. ..... The lack of luminosity is because there is a lack of star-forming gas in the ...

www.nasa.gov/feature/goddard/2016/hubble-reveals-observable-universe-contains-10-times-more-galaxies-than-previously-thought

Hubble Reveals Observable Universe Contains 10 Times More Galaxies Than ... in astronomy is that of just how many galaxies the universe contains. ... there must be a further 90 percent of galaxies in the observable universe that are too faint ...

www.theatlantic.com/science/archive/2016/10/so-many-galaxies/504185

Oct 14, 2016 ... New research estimates there are 2 trillion galaxies in the ... The earliest estimates of the number of galaxies in the Universe were very small.

www.universetoday.com/30305/how-many-galaxies-in-the-universe

Nov 1, 2016 ... The wonderful thing about science is that it's constantly searching for new evidence, revising estimates, throwing out theories, and sometimes ...

www.spacetelescope.org/news/heic1620

Oct 13, 2016 ... The group came to the surprising conclusion that there are at least 10 times as many galaxies in the observable Universe as previously thought ...

phys.org/news/2017-01-universe-trillion-galaxies.html

Jan 16, 2017 ... Astronomers have long sought to determine how many galaxies there are in the observable universe, the part of the cosmos where light from ...

www.theguardian.com/science/2016/oct/13/hubble-telescope-universe-galaxies-astronomy

Oct 13, 2016 ... There are a dizzying 2 trillion galaxies in the universe, up to 20 times ... Scientists have puzzled over how many galaxies the cosmos harbors at ...

www.space.com/25303-how-many-galaxies-are-in-the-universe.html

Apr 1, 2014 ... Astronomers say there are 100 billion to 200 billion galaxies in the universe. But accurately counting the number of galaxies depends on ...

www.physics.org/facts/sand-galaxies.asp

According to the best estimates of astronomers there are at least one hundred billion galaxies in the observable universe. They've counted the galaxies in a ...