The Sun formed about 4.567 billion years ago from the gravitational collapse of a region within a large molecular cloud.
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Eventually these concentrations form massive filaments which fragment and undergo gravitational collapse forming planetesimals the size of the larger asteroids.
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This vacuum energy is theoretically unlimited, and if built up quickly enough, will stop gravitational collapse from creating a singularity.
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When a main-sequence star consumes the hydrogen at its core, the loss of energy generation causes its gravitational collapse to resume.
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This instability means that although the Kerr metric is axis-symmetric, a black hole created through gravitational collapse may not be so.
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Eventually, the heat from the gravitational collapse will cool and the objects will no longer be detectable from Earth, she said.
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"They have formed very recently ( in astronomical terms ) and are still under their own gravitational collapse, " she said.
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Having exhausted its nuclear fuel, the star is now shining faintly only because of the heat generated by its own gravitational collapse.
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This minimal formatting example repurposes a classic paper by Stephen Hawking and Roger Penrose " The Singularities of Gravitational Collapse and Cosmology"
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A star is unstable towards gravitational collapse if the gravitational energy liberated by shrinking would exceed the work required to compress it.
