Astronomers are narrowing down on the proof of the universe in its darkish ages by looking for the faint 21-centimeter radio sign emitted by early-day hydrogen. It’s a very faint emission, which occurs as a consequence of a spin-flip transition within the hydrogen atoms, and it features as a cosmic thermometer exhibiting when the earliest stars and black holes began heating the fuel between galaxies. Based mostly on shut to 10 years of observations of the Murchison Widefield Array (MWA) in Australia, scientists have produced probably the most detailed radio map of the early universe up to now and positioned probably the most stringent constraints on this historical sign.
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