A desktop black hole created in a lab in Italy has been shown to emit light, a discovery that could seal one of the biggest holes in theoretical physics and pave the way for physicist Stephen Hawking to win a Nobel prize.

The eerie glow is called Hawking radiation, and physicists have been hunting it for decades. In 1974, Stephen Hawking calculated that, rather than gobbling up everything in their path and giving nothing back, black holes can radiate like the heating element in a toaster.

But astrophysical black holes, the ultradense gobs of mass that lurk at the centers of galaxies and are left behind when stars collapse, radiate too dimly to be seen. So instead of looking at real black holes, a group of physicists led by Francesco Belgiorno of the University of Milan, Italy, created a miniature analog by shooting short pulses of intense laser light into a chip of glass. The results will appear in Physical Review Letters.

"This is an extremely important paper," said physicist Ulf Leonhardt of the University of St Andrews in Scotland, who built an artificial black hole in a phone line in 2008. "The experiment confirms that Hawking radiation can exist in principle."



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