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Black Holes

DANGER: THIS PREZI MAY CONTAIN POTENTIALLY USELESS PARAGRAPHS THAT HAVE THE POTENTIAL TO WASTE YOUR PRECIOUS TIME IF YOU SO UNFORTUNATELY MAKE THE DECISION TO READ ALL OF THE POTENTIALLY TIME-WASTING PARAGRAPHS. Anyway, Black Holes. Wheee.
by

Jane Ngai

on 26 May 2014

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Transcript of Black Holes

What are black holes?
A black hole is an object that has enough mass in a small enough volume that the force of its gravity is strong enough to suck in light or anything else and then prevent it from escaping. So even light cannot escape a black hole.
How are black holes formed?
Black holes are formed when a very massive star (at least 25 times heavier than the Sun) runs out of nuclear fuel and explodes as a supernova. What remains is a black hole, usually only a few times heavier than our Sun since the explosion has blown much of the star's material away.
Do Black Holes Live Forever?
Black holes don't live forever. They evaporate, slowly returning their energy to the Universe. In 1974, well-known physicist and author Stephen Hawking proved this by using the laws of quantum mechanics to study the region close to a black hole horizon.
Bibliography
hubblesite.org/explore_astronomy/black_holes/
The quantum theory describes the behavior of matter on the smallest scales. It predicts that tiny particles and light are continuously created and destroyed on scales smaller than an atom. Some of the light thus created actually has a very small chance of escaping before it is destroyed. To the person who is viewing, it is as though the event horizon glows. The energy carried away by the glow decreases the black hole's mass until it is completely gone.
by Jane Ngai and Matthew Leung
How big is a black hole?
The size of the event horizon is proportional to the total mass of the black hole. Astronomers have found black holes with event horizons ranging from 6 miles to the size of our solar system. But in principle, black holes can exist with even smaller or larger horizons. By comparison, the radius of the Earth is about the size of a marble. This is how much you would have to compress the Earth to turn it into a black hole. A black hole doesn't have to be very massive, but it does need to be very compact.
How do you find black holes?
Black Holes
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Thanks for watching!
by Jane Ngai and Matthew Leung
Black holes in the Universe do not emit any detectable types of light, but astronomers can still find them and learn a lot about them. They do this by measuring the visible light, X-rays and radio waves emitted by material in the regular environment of a black hole.
How Black Holes Function
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For example, when a normal star circles around a black hole we can measure the speed of the star by studying the visible light that it emits. Knowledge of this speed can be combined with the laws of gravity to prove that the star is in fact orbiting a black hole, instead of something else. It also yields the calculation of the mass of the black hole. Alternatively, when gas orbits around a black hole it tends to get very hot because of friction. It then starts emitting X-rays and radio waves.
CONCLUSION
Black holes can be discovered and studied by looking for bright sources of X-rays and radio waves in the sky.
Now, it is time for us to state the obvious. There is a video on black holes you are not going to watch because you will be sleeping. Nevertheless, it will be playing to entertain and enlighten the non-sleeping people. Don't enjoy!!!
How Many Black Holes Are There?
Trying to count all the black holes in the Universe is like trying to count all the grains of sand on a beach. It is impossible to count all of them when they are so many and so far away from Earth. Fortunately, the Universe is enormous and none of its known black holes are close enough to pose any danger to Earth.
If you are still wondering how many black holes there are, the answer is that nobody knows.
Sun
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BREAKING NEWS!
Black holes use their ever growing gravitational pull to suck other black holes in and accumulate in size. But when two equally large black holes get sucked in, they start to orbit around each other, pulling each other closer.After getting close enough, one of them must swallow the other, making it swell. Recently a pair have been spotted 2 billion light years away from Earth.
A BLACK HOLE'S DEATH DANCE
Necessary Precautions
to Take! Must read!
When you feel an immense gravitational pull similar to the ones you are affected by when you are jumping up and down, the optimal thing to do will be to dash calmly into the nearest building and take precautionary shelter there.

Then, calmly remind yourself that the nearest pair of black holes doing a death dance are two billion light years away from Earth and that the closest black hole is 3,000 light years away from Earth. As you are reminding yourself, please refrain from jumping or doing whatever activity that caused the immense gravitational pull that caused you to dash calmly into the nearest building in the first place.

When you do not feel that immense gravitational pull anymore, it may be safe to calmly dash back out of the building that you were taking shelter in because there was an immense gravitational pull.

After that, please refrain from jumping or doing whatever activity that caused the immense gravitational pull that caused you to dash calmly into the nearest building. Thank you for taking your precious time to read and listen to this potentially useless paragraph. Have a great day!
THE BLACK HOLE OBSERVATORY TIMES

PHOTO GALLERY
Sun
Sun
Sun
Sun
Sun
16000000000mi
1600000000
TRIVIA TIME!
QUESTION ONE
What is a black hole?
QUESTION TWO
QUESTION THREE
How do you find black holes?
How many black holes are there?
BONUS QUESTION
What do you do when you feel an immense gravitational pull?
FOUR QUESTIONS PLUS ONE BONUS
QUESTION FOUR
Do Black holes live forever?
A black hole is an object that has enough mass in a small enough volume that the force of its gravity is strong enough to suck in light or anything else and then prevent it from escaping. So even light cannot escape a black hole.
Black holes can be discovered and studied by looking for bright sources of X-rays and radio waves in the sky.
The black hole that is currently thought to be the closest to Earth is at about 3,000 light years, with a mass roughly estimated to be 11.0 + 1.9 times the mass of the Sun.
The Black Hole Closest to Earth
Its name is
A0620-00/V616 Mon
Nobody knows how many black holes there are.
No. Black holes evaporate, slowly returning their energy to the Universe.
Answers :P
janengai123
Full transcript