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RandyD123
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If the Earth were hollow and we only had the shell could a black hole at the center take the place of all the mass and provide us with gravity to keep us from floating away?
RandyD123 said:If the Earth were hollow and we only had the shell could a black hole at the center take the place of all the mass and provide us with gravity to keep us from floating away?
Wouldn't the shell will orbit the center of the earth, considering it's 6200 km hollow space. 5 mm radius for Earth mass black hole, right?Dale said:Yes. (Ignoring the mechanical issues)
The shell isn't orbiting. It completely encloses a large volume of space with a black hole at the centre, yes. But it is not necessarily rotating at orbital speed, and is prevented from collapsing by its own mechanical strength, which may not be up to the task.Stephanus said:Wouldn't the shell will orbit the center of the earth, considering it's 6200 km hollow space. 5 mm radius for Earth mass black hole, right?
I'm not sure what this is meant to mean. As noted, the shell isn't necessarily orbiting. If it were, it can't be orbitting in 3 dimensions. A spin has an axis.Stephanus said:And wouldn't there be a shell at all? I think the shell will orbit the center in all 3 dimensions not like orbital plane.
4000 miles or 6000 km (40000/pi/2 = 6300 km)Dr_Zinj said:Not sure why you'd want a planetary shell of 6000 miles around an Earth-mass black hole; unless you were planning on a planet-sized Dyson sphere and were going to use a controlled drop of mass into the hole for power generation.
Geophysics has pretty much ruled out the existence of Pellucidar.
There is no experimental evidence supporting the idea that the Earth is hollow, and it is contradicted by a large body of evidence.Fervent Freyja said:Is there really any experimental evidence showing this could be true?
Dale said:There is no experimental evidence supporting the idea that the Earth is hollow, and it is contradicted by a large body of evidence.
The gravitational field of a black hole surrounded by a concentric spherical shell is indistinguishable from that of any other spherically symmetric mass distribution with the same total mass and radius. However, the system is not stable and the first time a gnat sneezed anywhere near it the game would be up. The shell would drift with respect to the black hole and the gravitational field at the surface would change measurably.Fervent Freyja said:Is there really any experimental evidence showing this could be true?
Ibix said:The Chandrasekhar mass, the minimum mass for something to collapse into a black hole under its own weight
A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape from it. This is due to the fact that the black hole has a very high concentration of mass within a small space, causing a strong gravitational force.
No, there is currently no evidence to suggest that there is a black hole at the center of the Earth. The Earth's core is made up of solid and liquid materials, and is not dense enough to form a black hole.
If a black hole were to suddenly appear at the center of the Earth, it would quickly start consuming the surrounding matter and growing in size. This would cause catastrophic effects on the Earth's structure and could potentially tear the planet apart.
No, it is not currently possible to create a black hole on Earth. Even with extremely high levels of energy, the conditions required to create a black hole are not attainable on our planet.
Scientists use a variety of methods to study black holes, including observing their effects on surrounding matter and using advanced telescopes and instruments to detect the radiation emitted by them. They also use mathematical models and simulations to better understand the behavior of black holes.