There is the possibility of alien worlds captured in the outer solar system, I am not talking about a planet 9, planet 9 would be a planet like the rest of the planets in the solar system that was created with the rest of the planets in the solar system and that is orbiting the sun from far away.
Not these, these would be planets that were created in other stars that were launched into space and that ended up being captured by the gravity of the Sun, I don't know why NASA likes to call them Rebel planets, they have not rebelled against anything, they simply They were formed in their system and were expelled or fired especially during the early stages of the formation of their planetary system, where there is usually a lot of chaos, a lot of collision between planets and catastrophic events that can cause a planet to end up being thrown out of its system. star system or they can also be thrown out of their system by the passage of a black hole.
When a massive black hole passes, not a small one, of stellar mass, that is, several times the mass of the sun, if it passed close to the solar system where the planets are, it could tear the planets off, it could cause the earth to be thrown away and it will be transformed On a wandering planet, those planets may be floating through space for eons and some may end up being captured by other stars.
We know that there are billions of wandering planets, it is believed that they are much more numerous than the number of stars, but we still do not know if any exist within the solar system, they could have been captured or could simply be passing through, because although they travel fast they do. It is normal for wandering planets to travel faster or even faster than the speed of the stars because if they did not travel faster than the stars, they would easily end up captured by one.
Although they travel fast, one of these wandering planets can take more than 1000 years to leave the solar system. They are huge, so it is possible that there are some that are passing through. There are also other hyper-fast wandering planets. Some scientists have calculated that there are interstellar planets. that can be launched by black holes, pass close to a black hole and end up being expelled at enormous speed, they could reach speeds of between 10 to 16 million kilometers per hour and if it were a supermassive black hole and under special conditions it could Traveling even at 48 million kilometers per hour is a brutal speed but even at that incredible speed an Interstellar planet would take almost 23 years to cross the solar system.
Here at this point we would ask ourselves if we could realize the proximity of a black hole, yes, a normal black hole, let's take away the primordial black holes, and of course from much earlier, the primordial black holes can have the mass of a planet and can go perfectly unnoticed or can even be orbiting the sun for millions of years without causing any problem, the problem is the black holes that we know of several times the mass at least so a typical stellar black hole could have 4 or 10 times the mass of the sun.
If it were close, we would begin to notice it simply in the strange movement of stars around us, and if it came closer, well, yes, it would cause us a lot of problems.
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