The theoretical physicist conducted research into black holes before their discovery.
. That will be the fate of our star, the sun, after it exhausts the hydrogen at its core in around 5 billion years. For stellar cores at least 1.4 times more massive than the sun, there is enough pressure, and thus heat, generated during gravitational collapse that further bouts of nuclear fusion can be triggered, with the helium created by the fusion of hydrogen itself forging heavier elements like nitrogen, oxygen and carbon.
This answer had already been delivered by a German physicist in 1916. Oppenheimer just had to find out how to get there. In 1915, while serving on the front with the German army during the First World War, astronomer Karl Schwarzschild got his hands on a copy of Einstein's theory of general relativity.
That was the theoretical birth of the black hole concept, but it didn't say anything about the creation of these cosmic titans — just that they can exist. Working with simple assumptions that neglect quantum effects and don't consider rotation, Oppenheimer set Snyder to work. And this paid off when the latter researcher discovered that what appears to happen to a collapsing star is dependent on an observer's point of view.
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