“The Cosmic Seagull” –Distant, Dark World Found Powered By a Hidden Force


The outermost stars in the Cosmic Seagull, a galaxy 11.3 billion light-years away, speed too fast to be propelled by the gravity of the galaxy’s gas and stars alone, indicating the hidden presence of dark matter, astrophysicist  “In our nearby universe, you see these halos of dark matter around galaxies like ours,” says Verónica Motta of the University of Valparaíso in Chile and her colleagues in the August 8 arXiv.org. “So we should expect that in the distant past, that halo was there, too.”


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