Scientists have evidence that galaxies throughout the universe are being strangled to death

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WASHINGTON: Scientists are now saying that they have definitive evidence that galaxies throughout the universe are being strangled to death.
Using the Sloan Digital Sky Survey, astro-boffins from the University of Cambridge as well as the Royal Observatory Edinburgh have analyzed metal levels in at least 26,000 average-sized galaxies in our “neighborhood.”
Dr. Yingjie Peng, with the Cavendish Laboratory at Cambridge as well as the Kavli Institute of Cosmology comments, “Metals are a powerful tracer of the history of star formation: the more stars that are formed by a galaxy, the more metal content you’ll see.” The lead study author also goes on to say, “So looking at levels of metals in dead galaxies should be able to tell us how they died.”
The theory is that galaxies dies when outflows of cold gas are yanked out from inside the galaxy suddenly. In the case of the infinite expanse of space, though, that “sudden event” actually takes about four billion years.