Overview And Background Of Black Hole

Introduction

Blackhole is the most mysterious objects in the universe. As early as one hundred years ago, Einstein proposed the concept of the black hole in general relativity, but the photo of the black hole in the first half of 2019 has just been released. This black hole photo is undoubtedly a major advance in astronomical history. The primordial black hole was thought to have formed in the early universe after the big bang. Stellar black holes form when the centre of a very massive star collapses in upon itself.

Such collapses can also produce supernovae or stellar explosions that blow some stars into space. Scientists believe that supermassive black holes are formed at the same time as the galaxies in which they are located. The size of a supermassive black hole is related to the size and mass of the galaxy it is in. A black hole is a region in space which curvature of time and space is so large that light cannot escape from its event horizon. The black hole is a singularity of the centre with an infinite density, an infinitely high curvature of time and space, an infinitely small volume, and an infinite heat. The end of a star is the start of a black hole.

Background of Black hole

Black hole is a region in space, and matter is very compact, even light can't escape from it. The 'surface', no matter inside, of black hole is called event horizon. Because the acceleration of gravity is derived from this formula: Where m(B) represents the mass of black. When the radius (R) of a star decreases, the gravitational field on its surface increases. This leads to a chain reaction in which a greater force collapses on the star, further reducing its size and increasing the gravity on its surface.

According Einstein’s general relativity, closing to the star itself, there will be strong distortion in the space structure, and found that acceleration caused by motion is equal to acceleration caused by gravity field. Black holes were first understood by Schwarzschild more than 100 years ago. In 1916, the exact solution of Einstein's field equation for the gravitational field outside a spherically symmetric object with non-rotating mass is obtained by Karl Schwarzschild. Schwarzschild mentioned that any object with a physical radius smaller than its Schwarzschild radius will be a black hole, which is decided by how big is that object. Where R(s) is Schwarzschild radius, G is the gravitational constant, M is the mass of the object and c is the speed of light. object mass R(s)

• Sun 2. 0*1030kg 3. 0*103m
• Earth 6. 0*1024kg 8. 7*10-3m
• Moon 7. 3*1022kg 1. 1*10-4m
• Jupiter 1. 9*1027kg 2. 2m
• Neutron Star 2. 8*1030kg 4. 2*103m