Karl Schwarzschild was a German astronomer and physicist, and a pioneer of the field of astrophysics. He solved Einstein's field equations while serving as an artillery office on the Eastern Front, during World War One.

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German

Astronomy

Astrophysics, field theory, General Relativity, electrodynamics, optics

Member of the Prussian Science Academy, 1912.

The Karl-Schwarzschild-Observatorium is in Thüringen, Germany.

There is an asteroid called *Schwarzschilda*.

Streets in Berlin, Göttingen und Garching bei München are named after him.

Professor and Director of the Sternwarte Göttingen (Göttingen Observatory), 1901 - 1909, where he worked with David Hilbert and Hermann Minkowski.

Director of the Astrophysikalisches Observatorium in Potsdam, 1909.

*Untersuchungen zur geometrischen Optik I, II, II.*, 1906. (Investigation of geometrical optics, volumes I, II, III).

Schwarzschild published many papers on astronomical subjects, such as the sun's atmosphere, the bending of light through a slit, electrodynamics, electron motion, fixed star motion, Halley's comet (1911), and the 'new mechanics'.

But his most important work is arguably on Einstein's theories of relativity, in particular the field equations, published in January 1916.

*Über das Gravitationsfeld eines Massenpunktes nach der Einstein’schen Theorie*, 1916 (On the gravitational field of a point mass according the Einstein's Theory).

*Über das Gravitationsfeld einer Kugel aus inkompressibler Flüssigkeit*, 1916 (On the gravitational field of a sphere of incompressible liquid, according to Einstein's Theory).

Astrophotography: he derived equations for the relationship between starlight intensity, exposure times and photoplate emulsion optical density, in which he derives the formula with the Schwarzschild Exponent.

The Schwarzschild solution: Exact solutions to the field equations for Einstein's General Relativity.

The Inner Schwarzschild solution: a general solution applicable to any incompressible fluid.

Schwarzschild radius and Schwarzschild black hole, formed by the gravitational collapse, with spherical symmetry, of a body to within the boundary of the Schwarzschild radius.

*$i = f(I⋅ t^p)$, $i$ is the optical density of exposed photographic emulsion, $I$ the intensity of the starlight, $t$ the exposure time, $p$ is the Schwarzschild Exponent, which is dependent on the photographic plate, and is always < 1.*

Schwarzschild was the first to express the electromagnetic field in Lagrangian form.

Field free variational formulation of electrodynamics.

Schwarzschild radius: $R_s = {2GM}/{c^2}$, $G$ is the gravitational constant, $M$ is the mass, $c$ is the speed of light in a vacuum. $R_s$ is the boundary between the Schwarzschild interior and exterior solutions, a locus of points in space around the central mass $M$, within which everything, including photons, must fall into the central Mass.

Schwarzschild is known as the grandfather of black hole theory. He did not term the phrase (attributed to John Wheeler, 1960s), but is solution to the Einstein General Relativity field equations led to the mathematical calculation of the Schwarzschild radius - the set of points equidistant from a mass that is compressed as much as possible, at which the gravity is so intense, that the consequent bending of spacetime does not permit light to escape.

Tragically, this gentle genius died on May 11, 1916, of an auto-immune skin disease (Pemphigus vulgaris) he contracted in the trenches soon after sending his famous solution to Einstein. He was invalided back to Germany in March 1916, but died on 11 May 1916.

Karl Schwarzschild's son, Martin, born 1912, fled nazi-Germany in 1935, and settled in the USA, where he was an astrophysicist from 1947 at Princeton University. It is pleasing to see that he was able to continue his father's work at the same time and place as Einstein, whom his father had helped so much establish his General Relativity.

(Biographies of famous scientists no. 62)

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