Sina science and technology news, Beijing time, August 20 news, according to foreign media reports, our solar system outside the strange composition of matter, let some scientists speculate, perhaps in a long time ago, our sun also had its own small partners. Interestingly, this can also explain the existence of the hypothetical ninth planet – if it does exist. < / P > < p > according to the latest research published in the Journal of astrophysics, our hypothetical twin brother of the sun has been lost for a long time, but we can still find the trace of this twin brother in the vast amount of material in the outer layer of the Oort cloud. There are a lot of exoplanets in the middle and outer regions of the cloud. Unlike the doughnut like Kuiper belt, the Oort cloud is a huge, thick spherical shell that surrounds the entire solar system. The inner edge of the Oort cloud is about 1000 Au away from the sun (AU represents the distance from the earth’s sun), while its outer edge is about 100000 Au away from the sun. < / P > < p > this area is filled with billions or even trillions of ice and rock objects left behind by the formation of the solar system. The new paper suggests that so much material in the outer orte cloud is due to the fact that our solar system was originally a binary system. < / P > < p > so far, computer simulations of the shape of the solar system have failed to reproduce the proportions of objects we have observed in the outer layer of the Oort cloud and in the discrete disk (a specific group of extraneptune objects outside the Kuiper belt). Therefore, the origin of the outer layer of the Oort cloud is “an unsolved mystery”. < / P > < p > if the sun has planetary partners, it can improve the chance of the sun’s birth star cluster to capture celestial bodies. The sun and its partners are like a catching net, which can “catch” the bodies that lose energy near one of the two stars through gravity. A birth cluster is a cluster of stars that appear together in the same molecular cloud (also known as a gestating Nebula). However, under the influence of strong stellar winds and tidal gravity exerted by the galaxy itself, star clusters will eventually disperse. Therefore, the sun’s imaginary twin brother has been pushed far and far. < / P > < p > a popular theory holds that the birth of the Oort cloud is related to the debris left during the formation of the solar system. Planets will pull the distance between objects larger and larger. However, this model is difficult to reproduce the proportion of discrete disk objects observed in the Oort cloud. And our model can explain this ratio. < / P > < p > in order to capture such a large amount of matter, the hypothetical second sun should have the same mass as our own sun. In other words, the two suns are basically twins. The new model shows that the distance between the two stars is about 1000 Au. The assumption that the sun was a binary system at the time of its birth is entirely reasonable. In fact, our observation of young clusters also shows that a large proportion of stars similar to the sun are born in the form of multiple galaxies, and then gradually separate. However, when the two stars are farther away, a large amount of celestial matter will be lost. However, the authors believe that there are still enough remaining objects to explain the Oort cloud. The stars that pass the birth cluster are likely to be the “culprit” for the separation of the sun from its supposed brother, but our solar system has already captured outer clusters of objects, such as the Oort cloud and the very likely ninth planet. Due to some special Kuiper belt object clusters, this huge ninth planet may exist in the outer solar system. The existing hypothesis of the origin of the ninth planet suggests that the planet is a huge air mass formed in the inner solar system, but it was pushed into the outer solar system after it was close to Jupiter. The new paper offers another possibility: the ninth planet was captured by our solar system. < / P > < p > not only is the formation of the Oort cloud an unsolved mystery, but also the formation of extraneptune objects, such as the possible existence of the ninth planet. At present, we still don’t know where they come from. But the model predicts that there should be more objects with orbits similar to those of the ninth planet. < / P > < p > Vera C under construction. Rubin Observatory will be opened and put into operation in 2021. At that time, the observatory may be able to prove or deny the existence of the ninth planet. It is still very difficult to find our sun’s long lost twin brother. The alien star “may now roam anywhere in the galaxy.”.