アルベルト・アインシュタインさんのインスタグラム写真 - (アルベルト・アインシュタインInstagram)「Posted @withregram • @nobelprize_org Black holes are bodies with gravity so strong that not even light can escape. To create a black hole, the earth would have to be squeezed down to the size of a pea and the sun compressed into a sphere comparable in size to the central parts of Stockholm. The first speculation that such a thing could exist in our universe dates back to the end of the 18th century. But it was not until Einstein presented his general theory of relativity in 1915 that one had a theory powerful enough to describe them... But the mathematics of the general theory of relativity is difficult, and for a long time black holes were mere speculation. And many physicists, for good reasons, doubted their existence. Not even Einstein thought they could exist. It was only in 1965, half a century after Einstein formulated his theory, that Roger Penrose (pictured) was able to master the mathematics and show that black holes are an inevitable consequence of general relativity. If matter accumulates densely enough, nothing can prevent a collapse into a black hole. This excerpt is from the award ceremony speech can be read in full on nobelprize.org. Penrose shared the 2020 Physics Prize with Reinhard Genzel and Andrea Ghez. Photo: © Nobel Prize Outreach / Fergus Kennedy. #NobelPrize #NobelLaureate #physics」12月22日 23時25分