The first mathematical proof that black holes could exist didn't come from a university lab, but from the front lines of World War I. In late 1915, a German artillery officer named Karl Schwarzschild was calculating shell trajectories on the Eastern Front. In his spare moments, he took on an even greater challenge: solving Albert Einstein’s new, complex equations of general relativity. He found an exact solution, which he sent to an astonished Einstein. Schwarzschild's math described a 'singularity,' a point where gravity warps space and time infinitely. Einstein was skeptical, believing nature would never create such a 'monstrous' object. Tragically, Schwarzschild died just months later, never living to see his mathematical curiosity confirmed as a reality in the cosmos.
Black Holes
Explore black holes, from their prediction by Karl Schwarzschild on WWI front lines to the first-ever photo of M87*’s event horizon.
A Monstrous Idea
Frequently Asked Questions
What is a black hole?
A black hole is a region of spacetime where gravity is so strong that nothing—no particles, no light—can escape. It forms when a massive star collapses under its own gravity at the end of its life, squeezing an immense amount of mass into an infinitesimally small point.
Can we see a black hole?
Black holes themselves are invisible because they trap all light. However, astronomers can detect them indirectly by observing their effects on nearby matter, such as stars orbiting them or gas being heated to millions of degrees as it's pulled in. The Event Horizon Telescope captured the first direct image of a black hole's silhouette in 2019.
What happens if you fall into a black hole?
An object falling into a black hole would experience extreme tidal forces that stretch it vertically and compress it horizontally, a process nicknamed 'spaghettification'. For a small black hole, this would tear you apart before you even reached the boundary. For a supermassive one, you might cross the boundary unharmed, only to be spaghettified later.
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