A group of researchers from Princeton University (USA) has thoroughly analyzed the probability of collision of Earth with a black hole and the possible consequences of the event. The findings were surprising: this is the history of our planet is likely to have occurred, and a lot of times! Just mankind for many years did not even guess …
Black holes are non-quantum origin are divided into two groups. These are the remnants of massive stars (their "lifetime" mass is 3.6 times or more the mass of our Sun) and primordial black hole — an area of high gravity, which are produced by themselves. The first group are our greatest danger, as in the case of a collision, they are able to destroy the entire solar system.
However, fortunately, such objects in the universe come across very often. But at the time of the Big Bang, supposedly created the universe, and immediately after the uniformity of the gravitational field and matter density could be affected to such an extent that it led to the collapse and formation of the so-called primordial black holes, which had a lower limit on the mass — in other words, they could have a very small size.
In this case, the primordial black holes had to quickly "die" as a result of the evaporation of energy and mass: the smaller the black hole, the faster it "evaporates" because the greater the ratio of the size of the event horizon and the mass of black holes.
Of course, midget black holes collision with Earth is possible: they simply do not exist anymore, evaporate at the dawn of the universe. If this had not happened, at the time of the "demise" of the black hole would have happened allocation of the amount of energy roughly equivalent to that released in the explosion of 10 million nuclear bombs!
But there are still a small black holes whose mass is more than 100 solar masses. And here they just can reach us. And now it turns unexpected thing: it turns out, these holes can visit the earth with a frequency of 1,107 years. This means that for the time of its existence, our Earth hundreds of times collided with objects such as the sun would collide with them hundreds of thousands or even millions of times!
To what consequences such a space can cause a cataclysm? Scientists at Princeton contend that the passage of even a small black hole through the Earth will cause a large part of the planet is spherically divergent seismic waves. Although researchers believe such consequences "minor" on a cosmic scale, in the sense that the global catastrophe is possible, seismic disturbances caused by the black hole, can still be quite noticeable for earthlings.
Get at least the fall of the Tunguska meteorite in 1908, when the people who were for a hypothetical 70 kilometers from the epicenter, has related the blast on many meters … The calculations showed that this event happen in just four hours later, Vyborg and St. Petersburg would have been part of the completely destroyed . Lucky that supposed "meteorite" fell over the taiga and not over densely populated! Otherwise the consequences of such a "hit" could well be compared with the effects of a nuclear attack.
The first suggestion that this event was caused by the collision of Earth with a primordial black hole, was put forward in 1973 by the staff of the University of Texas A. Jackson and M. Ryan. But no specific calculation was then carried out, and now talking about it only as one of the available versions. Meanwhile, the Princeton group believes that the shock effect of the Tunguska phenomenon that is consistent with the scale of the devastation that would come in contact with the aforementioned black hole.
However, note prinstontsy, this theory is not confirmed, as in this case would be fixed "output burst" on the opposite side of the globe. But it never came. Although the point of the story is too early. First, the projected area is sparsely populated exit (this plot Atlantic Ocean between Greenland and Newfoundland). Second, the calculations were performed only for entering a black hole in the earth at a right angle, and it could crash into the planet and any other angle, and therefore, to accurately determine its "output" parameters can not.
But, anyway, to establish the relationship between the Tunguska catastrophe and the interaction of the Earth with a small black hole is not yet possible.
What about the giant black holes that are certainly able to crush us into a cake? Here scientists from Princeton calm: the probability of encountering such an object is inversely proportional to its mass and desyatimilliardnom time interval is defined as "disappearing". So from that side of the danger we have so far not threatened.