= Hartland Snyder
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<Hartland Snyder> and <J. Robert Oppenheimer> calculated the gravitational collapse of an idealized, spherical, pressureless star. The <Oppenheimer-Snyder model> connects a comoving dust interior with a vacuum exterior and follows contraction beyond the limits of a static stellar model.<On Continued Gravitational Contraction by J. Robert Oppenheimer and Hartland Snyder>[1939 spherical-collapse calculation and distant/comoving time descriptions]{ref}
The example separates a finite proper-time history of falling matter from the distant-coordinate description of increasingly redshifted light. Its neglected pressure and ideal symmetry make the mechanism tractable, while limiting its use as a detailed model of a real explosion.
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