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https://news.northwestern.edu/stories/2017/july/milky-way-origin-matter-galaxy/
In a first-of-its-kind analysis, Northwestern University astrophysicists have discovered that, contrary to previously standard lore, up to half of the matter in our Milky Way galaxy may come from distant galaxies. As a result, each one of us may be made in part from extragalactic matter.
Using supercomputer simulations, the research team found a major and unexpected new mode for how galaxies, including our own Milky Way, acquired their matter: intergalactic transfer. The simulations show that supernova explosions eject copious amounts of gas from galaxies, which causes atoms to be transported from one galaxy to another via powerful galactic winds. Intergalactic transfer is a newly identified phenomenon, which simulations indicate will be critical for understanding how galaxies evolve.
"Given how much of the matter out of which we formed may have come from other galaxies, we could consider ourselves space travelers or extragalactic immigrants," said Daniel Anglés-Alcázar, a postdoctoral fellow in Northwestern's astrophysics center, CIERA (Center for Interdisciplinary Exploration and Research in Astrophysics), who led the study. "It is likely that much of the Milky Way's matter was in other galaxies before it was kicked out by a powerful wind, traveled across intergalactic space and eventually found its new home in the Milky Way."
Galaxies are far apart from each other, so even though galactic winds propagate at several hundred kilometers per second, this process occurred over several billion years.
Abstract and full journal article are available on arXiv: The Cosmic Baryon Cycle and Galaxy Mass Assembly in the FIRE Simulations
(Score: 2) by aristarchus on Saturday July 29 2017, @06:09PM (2 children)
From the stackexchange:
I think we have found the problem!
(Score: 0) by Anonymous Coward on Monday July 31 2017, @01:14PM (1 child)
Without data about the dick the tiny balls service, the information on the size of the balls is irrelevant for establishing whether or not this size constitutes a problem.
Just saying.
(Score: 0) by Anonymous Coward on Tuesday August 01 2017, @04:48AM
Typical Terran, thinking about spatial parameters, when it is the efficaciousness of the organ that matters. (Just to let you know, I slipped a micro-dick into you while you were reading this post. You probably felt nothing. And not to worry, the gestational period is about 50 of your Earth years. They will probably call it "cancer". Thank you for furthering our species, you cuckservative!