After a nearly twenty-year long game of cosmic hide-and-seek, astronomers using ESA’s XMM-Newton space observatory have finally found evidence of hot, diffuse gas permeating the cosmos, closing a puzzling gap in the overall budget of ‘normal’ matter in the Universe.
via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/XMM-Newton_finds_missing_intergalactic_material
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