Let's understand the Universe | Black Hole

^{Seyfert Galaxy. Credits:NASA/ESA-Hubble}

So that they can understand the concept of one of the greatest enigmas of the universe we must return to the past and review the most important theories.

^{Issac Newton. credits:Wikipedia}

Isaac Newton

^{Científico Británico}

Newton, defined the gravitation as:

"The force that a body exerts on another body with mass"

^{John Michell. credits:Ecured}

John Michell

^{Geologist and English astronomer}

^{Pierre Laplacecredits}

Pierre Laplace

^{Mathematician, Astronomer and French Physicist}

^{Albert Einsteincredits}

Albert Einstein

^{German physicist}

^{Karl Schwarzschildcredits}

Karl Schwarzschild

^{Physicist and German astronomer}

As we can notice, when jumping we fall again, when we throw a ball upwards, it falls again. This is because he does not have enough momentum to leave the planet. A rocket needs 11.2 km / s to escape from our planet, this is called escape velocity.

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First contact...

^{Cygnus constellation}

The Cygnus X1 event is a way to create a black hole. But there are other ways, one of which is what I will explain next...

^source

But... what happens in the Event Horizon?

Imagine now that in the event horizon an astronaut falls, inside a black hole it would accelerate until reaching the speed of light when all the effects of general and special relativity would come into force. So time would slow down and the astronaut would increase more and more in mass.

For an external observer, time would pass so slowly that it would seem an eternity, because when the astronaut arrives at the horizon of events, time almost stops. In addition, radiation in the form of X-ray and gamma rays emitted by the black hole would cause the astronaut to die long before reaching the event horizon.
^{Werner Zeilinger}

If the hole is black, how can they detect it in the universe?

A black hole would be almost invisible in the dark background of the universe, but it is not impossible to detect it. When black holes are born they produce gravitational waves that are possible to detect them, also when they pass close to a celestial body deforming their light, also when these black holes are "devouring" they produce X-rays that are also detected by space telescopes.
^{Gif Source}

In the galactic center of our Milky Way, there is also a black hole of about 2.6 million solar masses that astronomers called Sagittarius A. It was possible to detect it from the observation of a group of stars that turned to a dark point to more of 1500 km/s.

^{Heart of the Milky Way Galaxy. Credit: NASA - Hubble}

Undoubtedly, black holes are one of the most destructive, fascinating and mysterious phenomena of our universe.

In our universe could there be another a phenomenon similar to a black hole that can teleport us to another place in the Universe? Wormhole?

Gif Wormhole

Sources:
^{1. Milky Way - Wikipedia 2. Cosmos - Black Holes 3. Institute of Theoretical Physics 4. Black Hole 5. Documentary-Black Holes 6. ABC.es 7. Black Holes - Wiki}