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The Jeans instability is a concept in astrophysics that describes an instability that leads to the gravitational collapse of a cloud of gas or dust. [1] It causes the collapse of interstellar gas clouds and subsequent star formation. It occurs when the internal gas pressure is not strong enough to prevent the gravitational collapse of a region ...
Gravitational collapse of a massive star, resulting in a Type II supernova. Gravitational collapse is the contraction of an astronomical object due to the influence of its own gravity, which tends to draw matter inward toward the center of gravity. [1] Gravitational collapse is a fundamental mechanism for structure formation in the universe.
The most basic gravitational stability analysis is the Jeans criteria, which addresses the balance between self-gravity and thermal pressure in a gas. In terms of the two above stability conditions, the system is stable if: i) thermal pressure balances the force of gravity, and ii) if the system is compressed slightly, the outward pressure ...
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[2] [38] As the collapse continues, conservation of angular momentum means that the rotation of the infalling envelope accelerates, [39] [40] which largely prevents the gas from directly accreting onto the central core. The gas is instead forced to spread outwards near its equatorial plane, forming a disk, which in turn accretes onto the core.
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The the Chicago area is already at $4.07 a gallon, according to AAA, but that average price, based on Tuesday’s prices, was down 1 cent from the previous day. For more CNN news and newsletters ...
On July 23, 1984, an explosion and fire took place at a Union Oil Lemont Refinery in Romeoville, Illinois, outside Chicago, killing 17 people and causing major property damage. [2] The explosive force propelled the upper portion 14 metres (46 ft) of the vessel a distance of 1 kilometre (0.62 mi) from its original location, while the base ...