The Earth could be destroyed even by the thousands of light years far black holes

For the universe we can say that it's an interesting and a beautiful place, till when we remember that there are lots of threats for our planet.
The death of the sun, the dangerous asteroids and even the thousands of light years far black holes could destroy the Earth.

In the last epizode of "Kurzgesagt", they explain that the black holes can throw out extremely strong energy pulses that are called flashes of gamma radiation -  or "death from the space". The pulses can be thrown out anytime and anywhere.We can just hope that we won't become their target.

Gamma rays are electromagnetic waves that carry energy, just like the visible light. But unlike light, they are very, very powerful. 

One photon of gamma rays has energy more than 1 million photons of visible light together and can cause disruption in our DNA. 

Fortunately, the Earth is protected from most gamma radiation from space by ozone. But those are ordinary gamma radiation, while the glow of gamma rays is extremely strong.

It looks like to gather energy from every star in the range of 100 million light years, that means to absorb the energy of thousands of galaxies, each with billions of stars and all that power to be concentrated in one laser. That's how flash of gamma radiation looks like.

So far it is known two types of flashes of gamma radiation - long and short. The long ones last about a minute and it is thought they originate from the breakdown of a supernova into a black hole. The short ones last only second and scientists believe that they arise when two binary stars merge to form a black hole.

Both cases end on the same way - with the formation of a black hole surrounded by a magnetized disk of gas left over from its parent star (or stars).

As explained in the video, the rotation of the black hole raises the magnetic field which in forms a funnel that spews hot jet of particles that travel at the speed of light. The gases inside the funnel create two extremely focused beams of gamma rays, which spew out of a black hole, like a laser gun.

These flashes of gamma radiation occur everywhere in the Universe - NASA's Space Telescope "Fermi Gamma-ray Space Telescope", registers an average of one per day. But as far as we know, so far in our cosmic neighborhood, none was directly aimed at us.

Luckily, because even if it occurs at a distance of several thousand light years, gamma splashes could completely wipe our ozone layer and to leave the planet - and most complex forms of life, burned by solar radiation. Watch the video to see how it looks like in action.

In fact, the destructive force is the reason why some scientists believe that we haven't seen yet signs of life somewhere in the universe.

And what is most frightening, the flashes of gamma radiation are moving at the speed of light, such can currently travel toward us, and we can not get any sign that alerts us until it hit us - and  wipe us .