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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 ...
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 key idea in explaining the way in which structures evolve in the universe is gravitational instability. [1] If material is to be brought together to form structures, then a long-range force is required, and gravity is the only known possibility.
The efficiency η of a thermogravitational cycle depends on the thermodynamic processes the working fluid goes through during each step of the cycle. Below some examples: If the heat exchanges at the bottom and top of the column with a hot source and cold source respectively, occur at constant pressure and temperature, the efficiency would be equal to the efficiency of a Carnot cycle: [1]
Authorities were "unsure" what happened first - the derailment or bridge collapse, local media reported. The rail cars were carrying asphalt and molten sulfur, substances that quickly solidify ...
“The collapse of the AMOC has huge implications, and we can’t just sit back and say, ‘I don’t know, maybe we’re wrong,’” Susanne Ditlevsen says, shrugging. “I hope we’re wrong ...
During the trial, testimony from several former General Motors engineers showed that the design of the fuel tank was too thin and placed too close to the ground. Also, internal documents showed that the placement of a metal shield could protect the most vulnerable parts of the gas tank and greatly improve safety, at a cost of $4.50 per vehicle. [3]