Dimensions of The Solar System Questioned Again

Employees of the Southwest Research Institute in the Balder (Boulder) in the United States put forward the hypothesis that the solar system can be much more extensive than previously thought, and the boundary of the solar system lies beyond the Kuiper Belt.

Employees of the Southwest Research Institute in the Balder (Boulder) in the United States put forward the hypothesis that the solar system can be much more extensive than previously thought, and the boundary of the solar system lies beyond the Kuiper Belt.

The Kuiper belt is 50 AU from the Sun. Meanwhile, for the majority of stars with dust disks (its existence – an indirect sign of the presence of planets in the system) is characterized by a much greater range of such discs. In New Scientist magazine indicate that the diameter of the disc, some stars reaches 3000 AU

It is believed that the formation of the solar system from the primary gas-dust disk started about 4.5 billion years ago. Observations of comets suggest that some of the objects of this cloud in the first 100 million years flew away from the sun. It is believed that they formed Oortovo cloud surrounding the solar system.

That is referred to such objects Sedna, discovered in 2003, almost the size of the planetoid Pluto, but are almost three times more. Finding spurred debate about the true size of the solar system. The conventional wisdom is that Sedna formed near the sun and then went away from him.

However, according to Alan Stern, head of research at the Southeast Research Institute, Sedna could have formed quite precisely at the exact distance at which it is now (if not more) and has an orbit in the shape of a circle rather than ellipse.

This assumption is based on the results of computer simulation. Model, allowing the disc extended to 500 AU from the sun, have shown that, with sufficient density of the disk remained high probability of formation of objects like Sedna just within the first 100 million years after the appearance of the sun. Consequently, the outer edge of the Kuiper Belt may actually be nothing more than the inner edge of the remaining gaps in the gas-dust disk.

In principle, it is well within the pre-existing theory that the solar system could at some point in the early stages of its evolution, to move closer to another star, causing the outer edge of the Kuiper Belt proved to be “circumcised.” In favor of this assumption is strange and very elongated orbits of Pluto and Sedna. According to Stern, the original orbit of Sedna was located at 500 AU from the sun.

On the other hand, a similar “loophole” in the Kuiper Belt, according to Stern, and could make a planet the size of Mars, tore off the orbit and flown away from the sun.

Stern believes that the same distance as Sedna (ie, in its opinion at 500 AU) could be formed similar to a great variety of heavenly bodies, but to discover them now would be extremely difficult.

Not all agree with the conclusions of the Stern Review. For example, a colleague from the University of Arizona in Tucson, Rena Molhotra, argues that in the outer regions of gas and dust disc of original density is much lower, so that the possibility of nucleation sites the size of Sedna for the lifetime of the solar system, is very low, even if the disk is very large. Again, if it comes on the approximation of the solar system with another star, then Oortova Cloud would not exist because the other star of his should have been dispelled. According to Molhorty, we should not overlook the possibility that the outer edge of the Kuiper belt – it’s just a gap in the gas and dust is not scattered disk, and in fact he is far more extensive than is now.

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