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Half of the matter around us comes from distant galaxies

From Engadget - July 26, 2017

Their study, published in the Monthly Notices of the Royal Astronomical Society, used a supercomputer to simulate how galaxies are formed. They took a look at different sources of matter that would contribute to galaxy growth. Specifically, the team looked at the stars in our galaxy and determined where the matter that created them originated.

Their findings indicated that while the birth of stars fueled the growth of early galaxies, it was intergalactic transfer that was responsible for later increases in mass, primarily through galactic wind. "What this new mode implies is that up to one-half of the atoms around us -- including in the solar system, on Earth and in each one of us -- comes not from our own galaxy but from other galaxies, up to one million light-years away," says Claude-Andr Faucher-Gigure, one of the authors of the article.

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