Question

The field of work S. Chandrashekar is
(A) Theory of black holes
(B) cosmic rays
(C) Theory of relativity
(D) x -rays

Answer 1

HintWe know that general Relativity predicts that there is a singularity at the centre of a black hole. This is a point of infinite curvature of space-time and infinite density and gravity. Mathematicians and physicists hate infinities. If something falls into a black hole information about its state is lost. Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.

Complete step by step answer
We know that a black hole is a region of spacetime where gravity is so strong that nothing, no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. One idea is that black holes form things called wormholes. You can read this Curious Kids article to find out all about wormholes. These wormholes act as tunnels between two different parts of the space. This means that you could step into a black hole and end up in a completely different part of our universe.
A black hole is an invisible mass with a gravity pull so strong that light cannot escape. Black holes are stars that have burned out and compressed. The pull is strong due to the compactness of the mass. Black holes vary from one atom in size to the size of more than 4 million of the Earth's Sun. This black hole theory was discovered by S. Chandrashekar.

Hence the correct answer is option A.

NoteWe can add that black hole is an area of space with a gravitational field so strong that nothing, not even light, can escape it. That's why black holes appear black. In some cases, black holes are former massive stars that have been crushed to an extreme density during supernova explosions. Fortunately, this has never happened to anyone black holes are too far away to pull in any matter from our solar system. But scientists have observed black holes ripping stars apart, a process that releases a tremendous amount of energy. lack holes do not exist where space and time do not exist, says new theory. The quintessential feature of a black hole is its "point of no return," or what is more technically called its event horizon.