Stephen Hawking’s 1971 work looks into the so-called gravitational lensing phenomenon, which presupposes that a bunch of black holes zipping around at estimated incredible speeds would by all means bend the light of objects they pass in front of.

Although we are still in the dark about what dark matter essentially is, scientists have now ruled out one possible option, according to the research published in Nature Astronomy — that it is a bunch of minute black holes, as per a theory proposed by the ingenious Stephen Hawking back in 1971.

When an international team led by researchers from Japan’s Kavli Institute for the Physics and Mathematics of the Universe (IPMU) was hunting for a particular flicker of stars in a neighboring galaxy, the way the light would make itself visible if a miniscule black hole was passing in front of it, allowed them to capture 190 consecutive images over seven straight hours, using the cutting edge Hyper Suprime Cam on the Subaru Telescope at Mauna Kea in Hawaii.

If a primordial black hole, which Hawking suggested along with others, was a result of the Bing Bang, were to move between Earth and a star it’s expected that the star would brighten for a few minutes to hours as the black hole’s gravity magnified its light intensity.

Based on Hawking’s expanded hypothesis, which was notably first proposed by scientists Yakov Zel’dovich and Igor Novikov in 1966, the team assumed that the abundance of black holes smaller than the Moon required to produce the dark matter effect would lead to at least 1,000 lensing events. However, the observations arrived at just one potential event, which means that primordial black holes can account for no more than only 0.1 percent of dark matter.

The conclusion suggests that dark matter is something more massive than a plethora of teeny black holes, as proposed by the legendary scientist.

Although a great deal of further research is needed to rule out his theory altogether, one thing is clear for now – that we have to search for dark matter outside the domain of black holes.



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