Clash explains why Neptune is heavier than Uranium.
The unusual properties of Uranus and Neptune, and the anomalies in the position of the dwarf planets suggests that Solar system “collided” with another star in the first moments of his life. This conclusion was sewn astronomers, who published an article in the Astrophysical Journal.
“Flight of the stars through the Solar system – a more realistic alternative to the set of hypotheses, which now explains the unusual features of our planetary family. In contrast, we added to the classical model of the formation of only one new factor – the second star and the mechanism of its action, which leads to the appearance of all known anomalies,” explains Suzanne Pfalzner (Susanne Pfalzner) from the Institute for radio astronomy in Bonn (Germany).
Four years ago, Amateur astronomer Ralf-Dieter Scholz opened, as it seemed quite average star – red dwarf WISE J0720. Now he is in the constellation of the Unicorn, at a distance of about 20 light years it is one of the closest to the Earth stars.
Two years ago, American astronomers found that the star of Scholz relatively recently – about 70 thousand years ago – flew through the Solar system. She went to the Sun at a record close distance of about two light years, changing the orbit of many comets and small celestial bodies in the far side of the Oort cloud.
This discovery, as noted by Pfalzner has led many planetary scientists to think about how this approach of the Sun and other stars could affect the appearance of the Solar system. Such meetings, according to some researchers, could often happen in the first moments of life the light, when it has not left the “stellar nursery” in which it was born in the company of dozens of other stars.
For example, the convergence of the Sun and another star might explain why the orbits of Sedna, “Biden” and many other dwarf planets unusual, highly elongated and inclined in a special way in relation to “pancake” the rest of the Solar system. This deletes them from the Sun at a great enough distance to be able to recognize a part of the Oort cloud, where such behaviour is “acceptable” from the point of view of the theory.Pfalzner and her colleagues checked whether this actually counted a few dozen versions of this rendezvous of the Sun and its neighbors. For this, they created a virtual model of the dust cloud, which originally was a newborn Solar system, and began to push her with luminaries of different weights and sizes.
As unexpectedly showed these calculations, a “collision” of the Solar system and another star whose mass is approximately equal to or the sun was just below it, not only explained oddities in the position of the orbits of the dwarf planets, but also reveals almost all of the other mysteries of the “cradle of mankind”.In particular, the passage of another star at a distance of about 15 billion kilometers from the Sun will lead to the fact that it “steals” approximately two-thirds of the protoplanetary disk. This well explains why the Kuiper belt ends abruptly and becomes much less dense approximately the same place as the orbit of Neptune.
Similarly, this clash explains why Neptune is heavier than Uranium, despite the fact that it is farther from the Sun, and rotates on an unusual orbit. Moreover, this idea allows us to resolve another contradiction as both of these planets were able to form on the distant outskirts of the Solar system, where the protoplanetary disk was not dense enough for the birth of gas giants.
How likely is such an event? According to calculations of scientists, something like this can happen to any newborn star with a probability of around 20-30% in the first few tens of millions of years of her life.