Black hole facts
Here are some black hole facts that will surely help to deepen your understanding about black holes. A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. Black hole is not a hole at all, but rather a huge amount of matter packed in a very small mass. It is like 4 suns with gravitational field 28 times more than that of earth, squeezed together into a sphere of 24 km diameter. A black hole’s gravity is so strong that not even light can escape through it. Every black hole has an even horizon. The event horizon is the threshold around the black hole where the escape velocity surpasses the speed of light. This means from this point you need to fly with speed of light to avoid falling into the black hole. A black hole is formed when a large star starts running out of fuel and begins to collapse under its own gravity. Such a star may become a white dwarf or a neutron star, but if the star is sufficiently massive then it may continue shrinking eventually to the size of a tiny atom, known as a gravitational singularity.
Here are some amazing facts about black holes:
Black hole facts
Black Holes evaporate over time:
This phenomenon was discovered by Stephen Hawking and is known as Hawking radiation. Hawking radiation disseminates the Black hole into space and it continues to do so till there is nothing left. Due to this reason Hawking radiation is also known as black hole evaporation.
How time behaves around black holes:
As you get closer to a black hole, the flow of time slows down, compared to flow of time far from the hole. (According to Einstein’s theory, any massive body, including the Earth, produces this effect. Earth’s gravity is so weak that the slowing of time is not noticeable, but the effect has been confirmed using sensitive instruments. For example, at sea level you age one-billionth of a second less every year than you would if you lived on top of Mt. Everest.) Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. For instance, Suppose you and your friends were on a space exploration and accidently you slip into a black hole. Now as you are in process of falling into the black hole, your speed will appears to be decreasing to your friend. Your body will appear to be redder and redder as you are approaching the black hole. As your body hits the event horizon, your friend will see as if your body has come to stand still. However, in reality your body has went past to the event horizon and has moved towards the centre of black hole also known as singularity. If somehow you manage to live for some time in the black hole and return to earth you may see your friend aged decades while you just aged for couple of hours.
Black hole facts
What is inside a black hole :
Now again suppose the above situation. You have reached the event horizon of the black hole. Now there is two possibilities:
- If the size of black hole is small- then your feet and your head will experience differential gravitational force. Your body will stretch to the extent that your body will be ripped apart. This phenomenon is known as spaghettification. So you will die even before reaching the centre of the black hole.
- If the size of black hole is huge- then there will be no differential gravitational force acting on your body. All your body parts will feel almost equal gravitational pull. So this time you will experience no spaghettification. You will probably reach the centre of the black hole. Now some scientists believe that black holes are short cut to other universe. In the other universe the black hole opens as a white hole. White holes are opposite to black holes. However, unlike black holes you cannot enter the white holes from outside. So when you cross the centre of the black hole it is possible that you will be transported to some other universe. However you will not be able to enter again into the universe from where you have been transported.
Our Milky Way likely has a black hole:
A natural next question is given how dangerous a black hole is, is Earth in any imminent danger of getting swallowed? The answer is no, astronomers say, although there is probably a huge supermassive black hole lurking in the middle of our galaxy. Luckily, we’re nowhere near this monster — we are about two-thirds of the way out from the center, relative to the rest of our galaxy — but we can certainly observe its effects from afar. For example: the European Space Agency says it’s four million times more massive than our Sun, and that it’s surrounded by surprisingly hot gas.
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