A little bit of "Black hole"

 

They're some of the most violent objects in our universe, powerful enough to rip entire stars to pieces. Their secret weapon is gravity. You see, the more mass you can shrink into a small space, the stronger your gravitational force will become. Do you get touch, what thing I talk about? The answer is Black hole. Black hole is a hilarious & iconic invention in space of modern science. So, let's know a little bit about Black hole.

The words “black hole“ was coined in 1968 by the Princeton physicist John Wheeler, which man worked out everything details of a black hole's properties. The most common black holes are probably formed by the collapse of massive stars. The Black holes have two parts. There is the event horizon, which you can think of as the surface, though it's simply the point where the gravity(accelaration due to gravity) gets too strong for anything to escape. And other part is at the center, which is the singularity. That's the word we use to describe a point that is infinitely small and dense. Black hole contains a huge amount of energy which can't be explained.The energy takes form of a slow-but-steady stream of radiation and particles that came to be known as Hawking radiation. With every bit of energy that escapes, the black hole loses mass and thereby shrinks, eventually popping out of existence altogether.

There are usually about 4 types of black hole in the universe. They are: 1)stellar-mass black hole, 2)intermediate-mass black hole, 3)supermassive black hole, 4)primordial black hole.

New updates about Black hole

Scientists & Astronomers have discovered a new 'tidal disruption event,' in which the center of a galaxy lights up as its supermassive black hole rips apart a passing star. An ultra-massive black hole about 30bn times the mass of the Sun has been discovered by astronomers in the UK. Scientists at Durham University said the gargantuan black hole was one of the biggest ever found. NASA wrote in a release that “There's an invisible monster on the loose, barreling through intergalactic space so fast that if it were in our solar system, it could travel from Earth to the moon in 14 minutes". Dormant black hole Gaia BH1 lies only 1,600 lightyears away, making it the closest known black hole to Earth. It may seem blurry, but the supermassive black hole at the centre of the Milky Way has never been seen in such detail before. In fact, this is the first direct image of the cosmic behemoth, called Sagittarius A*.

Black hole & our galaxy & planet

We are in absolutely no danger from black holes. They're a bit like tigers – it's a bad idea to stick your head in their mouth, but you're probably not going to meet one on your way to the shops. Unlike tigers, black holes don't hunt. They're not roaming around space eating stars and planets. The possibility that a black hole could actually impact Earth may seem straight out of science fiction, but the reality is that microscopic primordial black holes could actually hit Earth. If one did, it wouldn't just impact like an asteroid, it'd pass straight through the entire Earth and exit the other side. Is it possible for a black hole to "eat" an entire galaxy? No. There is no way a black hole would eat an entire galaxy. The gravitational reach of supermassive black holes contained in the middle of galaxies is large, but not nearly large enough for eating the whole galaxy.

Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. For example, an object falling into the hole would appear frozen in time at the edge of the hole.