Karl Schwarzschild

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(1873-1916) German astronomer and physicist who developed the use of photography for measuring variable stars. He also investigated the geometrical aberrations of optical systems using ray optics by introducing a perturbation equation which he called the Seidel eikonal. Schwarzschild volunteered for military service and, while on the Russian front, completed the first two exact solutions of the Einstein field equations of general relativity, one in static isotropic empty space surrounding a massive body (such as a black hole ), and one inside a spherically symmetric body of constant density. Shortly after this work, Schwarzschild died of a rare metabolic disorder.