Malkan and colleagues used the United Kingdom Infrared Telescope in Hawaii and the Spitzer Space Telescope to collect the light from over 5,
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,000 galaxies. They found that, in all of these galaxies,
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, one wavelength of green light — now stretched to infrared by the expansion of the universe — was twice as bright compared with light from the typical mix of stars and gas seen in galaxies today.
The green light comes from oxygen atoms that have lost two of their electrons. To knock off two electrons requires harsh ultraviolet radiation,
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, possibly from lots of extremely hot stars — each roughly 50,
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,000° Celsius. The sun,
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, by comparison,
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, is about a paltry 5,
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,500° C at its surface.
“Stars must have been much hotter than most energetic stars familiar to us today,” said Malkan. How they got so hot — perhaps via exotic chemical abundances or just piling on lots of mass — is unsettled.
Mon,
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, 09 Jan 2017 22:20:41 +0000 https://www.sciencenew...rs-lose-their-steady-beat


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