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.[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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Hartland Snyder by Wikipedia Bot 1
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Hartland Snyder is not widely recognized as a term, brand, or individual as of my last update in October 2023. It could refer to a specific person, a business, or something else entirely, but without additional context, it's difficult to provide a specific answer.
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