Generate a random black hole from 34 real catalogued objects -- supermassive monsters, stellar-mass X-ray binaries, and the mergers gravitational-wave detectors heard -- each with its mass and story.
A black hole is a region where gravity is so strong that nothing -- not even light -- can escape once past its boundary, the event horizon. Most form when massive stars collapse at the end of their lives; the supermassive kind, millions to billions of times the Sun's mass, sit at the centers of galaxies including our own. They aren't cosmic vacuum cleaners: orbit one at a distance and it behaves like any other mass. Get close, and general relativity's strangest predictions -- frozen time, spaghettification -- become the literal forecast.
This generator collapses 34 real, catalogued black holes into one page -- supermassive galaxy-centers like Sagittarius A* and the photographed M87*, stellar-mass X-ray binaries like Cygnus X-1, the gravitational-wave mergers LIGO heard, and the oddities in between -- each with its mass and why astronomers care.
Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.
Pick a rabbit hole (sorry) for an astronomy night, stock a physics class with real objects instead of diagrams, find the actual names behind gravitational-wave headlines, or settle how big the biggest one is -- TON 618 at around 40 billion Suns takes some settling.
Generate draws one black hole at random using the site's cryptographically secure randomness, never repeating the object currently shown in single-result mode. Masses are given in solar masses, and the Class filter narrows to supermassive, stellar-mass, merger events, or the frontier oddities.
A sample of what this generator can draw, spread evenly across the full list:
As close as physics allows -- the Event Horizon Telescope imaged M87*'s glowing ring in 2019 and our own Sagittarius A* in 2022. The dark center is the shadow of the event horizon itself.
No candidate is anywhere near us -- the nearest known are over 1,500 light-years away, and black holes don't wander around sucking things in. Replace the Sun with an equal-mass black hole and Earth would keep orbiting exactly as it does (though it would get very cold).
Since 2015, detectors like LIGO have heard spacetime ripple when two black holes spiral together and merge. GW150914 was the first ever detected; GW190521 forged a 142-solar-mass hole -- the first confirmed intermediate-mass black hole.
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