Universe out of breath

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Universe out of breath

Postby Thom » Tue Oct 13, 2015 8:05 am

A recent article in Oct. issue of CernCourier quotes a new study of more than 200,000 galaxies on the radiation produced from stars, by Simon Diver et al., Australia. They compared co-moving volumes (remember: the universe expands) at different redshifts. Peak of star formation was when the unverse had an age of about 3Gyr, radiation with it. Thereafter, the universe keeps fading. Over the past 2 Gyr the average energy output decreased by roughly a factor two.

"The ongoing decay of energy production by stars in galaxies also follows the trend of galactic nuclei and gamma-ray bursts, which were all more numerous and powerful several gigayears ago. The shining, glorious days of the universe are now long past; instead it will contiunue to decline, sliding genlty into old age, an age of quiescence." (CernCourier)

The universe must feel like me, then.... ;)


Thom

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