There is more beyond our solar system.

In our imagination Pluto is still the border, beyond Pluto are the mysterious regions of the Kuiper belt and the Oort cloud, the planetary solar system is that little point in the center, there are all the planets and the Oort cloud would extend up to almost a light year, some say a little more.

It would be a bubble of comets, of dust, of dwarf planets, because there would also be hundreds of dwarf planets and more things, but it is huge and it is very important because we can be affected by what happens in it.

The graph of the Oort cloud, without a doubt an interesting representation, however, it does not consider the advance of the solar system in its trajectory around it, so it should have a more drop-shaped shape, that is, stretched towards the back side, it would have more of a more elongated drop shape and then I think it opened empty channels due to the passage of stars within the Oort cloud, passage of stars in the past and wandering planets, wandering planets, some may exist right now within the solar system.

The solar system continues to be the Oort cloud, and in the Oort cloud, beyond Neptune, beyond Pluto, at the edge of the solar system, there may be some very strange things, but what happens out there beyond Pluto is very difficult to grasp. Even so, we know that there are certain things that are not there, such as a black hole, at least not one of known stellar mass, since we would notice it. The entire solar system would be orbiting that black hole, since even the smallest black hole has more mass than the sun. It would have at least three or four solar masses.

There is also no star, because it would have already been detected, even if it were a brown dwarf. This does not mean that there were any in the past, but according to the Nemesis theory, which was proposed in 1984 by physicists R.A. Muller, Piet Hut, and Marc Davis, the Nemesis theory meant that the sun had a companion star orbiting it, which would be a red dwarf or a brown dwarf. Brown dwarfs are smaller than red dwarfs and emit much less light. They are also much cooler, and this companion star would orbit the Sun in a huge elliptical orbit between one and three light-years away. It would take about 26 to 34 million years to orbit the Sun, and in that orbit it would pass through the Oort cloud, destabilizing it and sending showers of comets toward the Sun.

This would explain, according to these researchers, the apparent periodicity of large impacts and mass extinctions, because it seems, there is a theory that says that they occur every 27 million years, the last mass extinction occurred about 11 million years ago, but this is quite relative because first, not everything that impacts the Earth are comets, there are also asteroids.

There are also other extinctions caused by various factors, such as massive eruptions, and there are mass extinctions of varying sizes. The one that occurred 11 million years ago was a partial extinction, affecting mammals, but not all of them, obviously, so it is quite relative. The point is that this theory from 1984 has been practically ruled out, and practically no one defends it because our observatory technology, both on land and in space, has multiplied enormously.

This does not mean that stars do not occasionally pass close to the solar system, or even enter the Oort cloud. The most recent example is Scholz's star, which is actually two stars, a small red dwarf and a brown dwarf. That was only 70,000 years ago, when they entered the Oort cloud, passing 0.8 light-years away.

Scholz's star, or rather the two stars, continued on their way and are now 20 light-years away. It is believed that their impact had little relevance on the Oort cloud; we would have noticed it, thanks to new observatories such as Gaya. We now have more information about how stars move, and the case of Sholzp's star is ridiculous when compared to what happened 2,800,000 years ago. At that time, our direct ancestors were Homo habilis, and when they looked up at the sky, they could see two suns, one being our sun and the other much dimmer but possibly visible in daylight. This would have been the star HD 797, a sun-like star that crossed the solar system half a light-year away and entered the Oort cloud completely.

This star is currently in the constellation Cassiopeia, about 246 light-years away. It is believed that its significant mass, similar to that of the sun, was enough to alter not only the orbit of trans-Neptunian objects, but also to alter or change the orbit of the planets, including Earth.

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