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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 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.
Unable to fragment and form stars, the gas cloud undergoes a gravitational collapse of the entire structure, reaching extremely high matter density at its core, on the order of ~10 7 g/cm 3. [14] At this density, the object undergoes a general relativistic instability, [ 14 ] which leads to the formation of a black hole of a typical mass ~ 10 5 ...
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 ...
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). [129] Gravitational collapse occurs when an object's internal pressure is insufficient to resist the object's own gravity.
Tight refining supply has kept the gap wide between wholesale gasoline futures and retail prices, currently at about $1.25 a gallon, far exceeding the average of 88 cents over the past five years.
In general relativity, the Oppenheimer–Snyder model is a solution to the Einstein field equations based on the Schwarzschild metric describing the collapse of an object of extreme mass into a black hole. [1] It is named after physicists J. Robert Oppenheimer and Hartland Snyder, who published it in 1939. [2]
The national average price for a gallon of gasoline is at $3.50, according to AAA as of Jan. 26, 2023. While the amount of pain at the pump people feel is more or less acute depending on their ...