A black hole bends light like a funhouse mirror, creating doppelgangers of stars. But if there's a cloud of invisible matter around the hole, the difference in the picture is vanishingly small. However, the twin beam arrives milliseconds later. These tiny delays will one day give away the secret of dark matter.
🎯 In 1912, [scientist:Albert Einstein]Albert Einstein[/scientist] predicted that gravity bends light; the first mirage ring was found only in 1979 with the help of radio telescopes.
🎬 In 'Interstellar', the heroes study the black hole Gargantua by the distorted light of stars—the scene almost exactly mirrors the calculations for the real M87*.