Thegeneral theory of relativitywas published by the physicsgeniusmore than a century ago, to refine Isaac Newtons law of universal gravitation. Providing a unified description of gravity as a geometric property of space and time, or spacetime, this model is still currently used by scientists asan explanationof gravitation in modern physics. Einsteins theory has important astrophysical implications as it alludes to the existence ofblack holes cosmic phenomenons in which space and time are distorted in such a way that nothing, not even light, can escape.
At the centre of a black hole, as described by general relativity, may lie agravitational singularity, a region where the spacetime curvature becomes infinite.
But whilemathematics says a singularity is possible, nature apparently proves these do not exist, Discovery Channels How The Universe Works exposed.
The series explained: When a giant dying star collapses, the mass of the star falls in and keeps falling in crushing down into an infinitely small point.
This is called the singularity.
But physicist Max Tegmark believes the singularity is just a fancy way of saying we have no idea what is happening here.
Astronomer Phil Plait explained why some experts have an issue with using this theory.
He said: The way our physics describes black holes when they form is youre taking a finite amount of mass and youre collapsing it down.
Its volume should shrink all the way down to zero, but that means it has infinite density and infinite gravity.
That doesnt make sense.
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Theoretical physics Lawrence Krauss then explained why some are questioning Einsteins theory.
He added: If you make a prediction and the answer is infinite, then it tells you that there is something wrong with your prediction.
We have never seen infinity in the universe.
Maybe a black hole with an event horizon described by general relativity just isnt the proper description of the physics.
Quantum mechanicsis a fundamental theory inphysicsthat provides a description of the physical properties ofnatureat the scale ofatomsandsubatomic particles.
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Leading astronomer and assistant director for Science Communication at NASAs Goddard Space Flight Centre, Michelle Thaller, explained why it is key to the debate.
She said in 2018: Have you ever thought about the term quantum mechanics and what those terms actually mean?
Everything in the universe is broken up into tiny units and there is a basic unit of energy, time and space that cannot be divided any smaller.
There is a limit to how small those things can be.
The smallest unit in the universe is what is known as a Planck Length to physicists.
But if there is a universal limit on the smallest size, then somethinginfinitelysmall cannot exist, according to some scientists.
Quantum mechanics expert Sean Carroll explained: If infinity doesnt exist, then singularities dont exist.
And if singularities dont exist, then Einsteins theory of General Relativity is not correct.
The simplest thing we can do is change some equations, change his theory of gravity.
Lets invent what we would call exotic speculative physics.
This has led scientists to invent the theory of the Planck Star.
Passing one in space would look like a black hole, but without a point of singularity at its core.
The star is just like a black hole, but it obeys the rules of quantum mechanics.
Physicist Max Tegmark detailed the new theory that has been proposed.
He said: Maybe things can be collapsed down to less than the Planck Length, or maybe you get stuck with a Planck-sized nugget.
It stabilises everything, keeps everything finite.
The reason why there are so many alternatives to black holes is because you can write down a gazillion different postulated mysterious new kinds of matter and say this exists, so maybe that explains the data.
The problem is there is no evidence that any of that kind of stuff exists.
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