A Black hole is a massive object or region in space whose gravity is so strong that nothing, not even light can escape from its pull. The border of the black hole or the gravitational field of the black hole is called the ‘event horizon’. If anything touches the event horizon, then it has no way of escape from the pull of the black hole and gets sued into it. However, black hole emits radiations. These radiations are called ‘Hawking Radiation’. Black holes are used in many fiction movies and are dreadful. Here are few facts about a black hole that you need to know.
- Black holes are ‘Black’ in color.
Black holes are black in color because there nothing that can resist the pull of a black hole, not even light can escape from it. Therefore you cannot directly see a black hole. Black holes are identified by the motion of objects around it. However, black holes emit electromagnetic radiations.
- Black holes slows down time and space
Due to the massive gravitational pull of the black hole, it distorts space and time. As you get closer to a black hole, the clock runs slower. Once something has reached the event horizon, it cannot escape but is sucked up by the black hole.
- Inside every black hole is a universe
Some equations give rise to an interesting suggestion that every black hole has a universe inside it. In fact, according to this suggestion, our universe is contained in a big black hole.
- Our milky way has a huge black hole at its centre
Astronomers say that there exists a supermassive black hole at the middle of our galaxy. It is said to be four million times massive than our sun and it is 30,000 light years away from the earth.
- Black holes are densest objects
To have enough gravity to pull even light into it, a black hole has to contain an incredible amount of mass in an extremely small space. This means that black holes must have a mass of about 10 to 30 billion times the mass of the sun.
- Different types of black holes
There are mainly three types of black holes- primordial type, stellar black holes and gargantuan ones. Primordial black holes are the smallest ones with size ranging from that of an atom to the mass of a mountain. The stellar black holes are the most common types and are 20 times more massive than our sun. Gargantuan types are the supermassive black holes present at the centers of galaxies and are million times more massive than our sun.
- Black holes can be observed from afar
Black holes do not pull objects which are not in the event horizon. That is, it is only when you get close to a black hole it sucks you into it. Otherwise, it is safe to observe the black from a safe distance. In fact, the gravitational field of a black hole is same as that of any other object of same mass.
- Black holes eventually evaporate over time
Though nothing can escape the pull of a black hole, it emits radiation. This process eventually leads to the loss of mass and thus banishing the black hole. However this is a slow process and it takes over billions of years for black hole evaporation.
- Massive stars collapsing upon itself
When a massive star runs out of fuel, it begins to collapse under its own gravity and thus a black hole is formed. If the star is sufficiently massive, it collapses and shrinks to the size of a tiny atom known as a gravitational singularity. A black hole refers to the region in space in which the singularity’s gravitational force is so strong that not even light can escape its pull.
- You will be stretched to death
If a person happens to fall into a black hole, he would not be crushed rather his body would be stretched and ripped. He would see distorted images as the light bends around him and he would also be able to see beyond the black hole as the light continues to reach him from outside.