Black Holes

Hi guys!


We've posted this on our blog a couple of months ago, but there is one thing from the book that has made us really interested on putting it up for you!
Since we wrote that we will teach you guys about black holes, it was about time we did. 
Please note that some of the information on black holes will be in read font because the information was from the book by Steven Hawking; George's secret key to the universe.


What is a black hole? A black hole is a large black hole that it's gravity is so strong that anything that tries to get out of a black hole gets dragged back. A black hole, is like a dead end on the streets. If you got sucked up into a black hole, you can't come back out from the same way you came in.


The edge of a black hole is called a "Horizon". This is like the edge of a waterfall. If you are above the edge, you can get away if you paddle fast enough, but once you pass the edge, you're doomed.


When more and more things get sucked up into a black hole, the black hole gets bigger, and stronger. 


How is a black hole made? One way that a black hole starts, is when a dead planet explodes. This is formed, because inside planets actually make new planets with their fuel. But once that fuel has run out to make new planets, the planet creating the new planets explodes of nitrogen, and black holes are formed. 


Can you see a black hole? Generally, you can't, because no light can get out of a black hole. But you can detect a black hole, because you notice that things from space are getting sucked up by a U.F.O. 


Normally, we can see a large black disc sucking up something, but that barely happens, because once again, no light can get out of a black hole.


Falling into a black hole You can fall into a black hole, just as you can fall into the sun. If you fall feet first, your feet will be nearer to the black hole then your head and will be pulled harder by the gravity of the black hole. So you will be stretched out length wise and squashed in sideways. The stretching and squeezing is weaker the bigger the black hole is. If you fall into a black hole made by a star only a few times the size of our sun, you will be torn apart and made into spaghetti before you can even reach the black hole. 


If you fall into a much bigger black hole, you will pass the horizon - the edge of a black hole and the point of no return - without noticing anything particular. 


Getting out of a black hole Technically, people believe that when you get sucked into a black hole, there is no way out. But then it was discovered that this picture wasn't quite right. Tiny fluctuations in space and time meant that black holes couldn't be the perfect traps they were once thought; instead they would slowly leak particles in the form of Hawking Radiation. The rate of leakage is slower the bigger the black hole is.


The Hawking Radiation would cause black holes to gradually evaporate. The rate of evaporation will be very slow at first, but it will speed up as the black hole gets smaller. 


So you see, that you can get out of a black hole. After billions of years, the black hole won't be in prison. When it leaks particles out, they are actually pieces of something or someone that has been sucked into a black hole. If you take out every single particle the black hole has sucked, you can maybe form someone or something that has been sucked into a black hole.


Thank you for reading!


Shiri and Tanna


P.S If you would like to see a video of black holes, scroll down to the bottom of all the posts, and click play on the video "The largest black holes in the universe". Thanks!