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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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Gas cloud being ripped apart by black hole at the centre of the Milky Way (observations from 2006, 2010 and 2013 are shown in blue, green and red, respectively). [128] Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity.
The same economic concerns that have prompted a massive sell-off in equities have also driven down the price of crude. It has retreated to $83 from over $110 in late April - a drop of 25% ...
[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.
Record-high gas prices might be in the rearview mirror for drivers, as prices at the pump have now fallen 30 days in a row amid a drop in crude oil.