📜 Timeline: Black Holes
16 milestones in the history of black holes.
Michell's "Dark Stars"
John Michell proposes that a star could be so massive that light could not escape its gravitational pull — the first theoretical concept resembling a black hole.
Source: Black Holes and Time WarpsLaplace's Dark Bodies
Pierre-Simon Laplace independently proposes dark bodies using Newtonian gravity.
Source: Black Holes and Time WarpsEinstein Publishes General Relativity
Albert Einstein publishes the field equations of general relativity, providing the theoretical framework for understanding black holes.
Source: General RelativitySchwarzschild Solution
Karl Schwarzschild finds the first exact solution to Einstein's equations, describing the spacetime around a non-rotating mass — revealing the Schwarzschild radius.
Source: General RelativityOppenheimer-Snyder Collapse
Oppenheimer and Snyder show that a massive star can collapse into a black hole, producing a singularity.
Source: General RelativityKerr Solution
Roy Kerr discovers the solution for rotating black holes, which describes most astrophysical black holes.
Source: General RelativityPenrose Singularity Theorem
Roger Penrose proves that singularity formation is a generic feature of gravitational collapse, not an artifact of symmetry assumptions.
Source: Black Holes and Time WarpsTerm "Black Hole" Coined
John Wheeler popularizes the term "black hole" to replace the cumbersome "gravitationally completely collapsed object."
Source: Black Holes and Time WarpsCygnus X-1 Identified
Cygnus X-1 becomes the first widely accepted black hole candidate based on X-ray observations and mass measurements.
Source: NASA: Black HolesHawking Radiation Predicted
Stephen Hawking shows that quantum effects cause black holes to emit radiation and slowly evaporate, bridging general relativity and quantum mechanics.
Source: A Brief History of TimeInformation Paradox Formulated
The realization that Hawking radiation appears to destroy information, violating quantum mechanics, launches decades of theoretical debate.
Source: Black Hole Information ParadoxFirst Gravitational Waves Detected
LIGO detects gravitational waves from two merging black holes (GW150914), confirming a key prediction of general relativity.
Source: Gravitational Waves from Binary Black Hole MergersNobel Prize for Gravitational Waves
Rainer Weiss, Kip Thorne, and Barry Barish receive the Nobel Prize in Physics for the detection of gravitational waves.
Source: Gravitational Waves from Binary Black Hole MergersFirst Black Hole Image (M87*)
The Event Horizon Telescope captures the first direct image of a black hole's shadow in galaxy M87, showing the bright accretion ring.
Source: First Image of a Black HoleNobel Prize for Black Hole Research
Roger Penrose (singularity theorem), Reinhard Genzel, and Andrea Ghez (Sgr A* observations) share the 2020 Nobel Prize in Physics.
Source: NASA: Black HolesFirst Image of Sagittarius A*
The EHT reveals the first image of the supermassive black hole at the center of the Milky Way — Sagittarius A*, 4 million solar masses.
Source: Sagittarius A*: First Image