A Saturn-sized rogue planet travels in space.

"A rare combination of Earth- and space-based observations has revealed the true mass and location of a rogue planet drifting through the galaxy. The Saturn-sized world likely formed around a star before being violently ejected into interstellar space. (Artist’s concept.) Credit: SciTechDaily.com" (ScitechDaily, A Saturn-Sized Planet Is Drifting Through Space Alone)

Rogue planets are wandering around the universe. Those planets have no stars, and they can enter other solar systems. When a nova or supernova eruption occurs. The planet. That is, in a very distant orbit to its star. Can. Be flung into interstellar space. Those explosions are very violent, but the shockwave can push distant planets. 

To the journey that ends somehow. Another star can capture those planets, or they can fall into black holes. But when we think about our future. Those rogue planets cause an existing danger. If they travel to our solar system. The large rogue planet can pull even large objects out of their trajectory. So, maybe. Someday, some large rogue planet will force us to develop an antimatter bomb. That can destroy that planet before it destroys us. 

Velikovsky’s Venus and the lost planet Vulcan.

What if Velikovsky’s Venus was a rogue planet that fell into the Sun? And what if the mythic Vulcan planet was a planet that fell to the Sun because of some cosmic impact? This doesn’t mean that those things are connected to each other. But. They are interesting things to think about. The fact is that the planet can fall into the Sun because of its atmospheric friction. A large asteroid can be mistaken for a planet. 

But then. An interesting idea. Came to my mind. That thing is about a theorem. Which was written by Immanuel Velikovsky, who claimed that the things. That happened in the Old Testament, in the Holy Bible. Like. Splitting the Red Sea happened because. Some other planet traveled across our solar system. Velikovsky suspected that the planet was Venus, but Velikovsky was wrong. Today, Velikovsky is described as a pseudohistorian. But what if Velikovsky had written the word “Rogue planet” instead of the word “Venus”?

In the time of Velikovsky, there was no idea of rogue planets. This means that it's possible. If a rogue planet traveled across the solar system and fell into the Sun. That would not leave any mark on the solar system. 

Another interesting idea is connected to Vulcan, the mythic planet inside Mercury’s trajectory. What if that mythic planet simply fell to the sun? We know that Vulcan does not exist. But maybe in history. There were planets that were impacted. With an asteroid. And then that asteroid could push that planet toward the Sun. But as I wrote, planets can also fall to stars without dramatic events. Or it can vaporize. 

When the flare eruption hits the planet. That can turn a planet into vapor. Especially if it's in melted form. The Vulcan, if it existed, must be pure lava. The solar eruption can destroy this kind of planet very fast. It's possible that Vulcan simply evaporized when it moved close to the sun. 

https://scitechdaily.com/a-saturn-sized-planet-is-drifting-through-space-alone/

https://en.wikipedia.org/wiki/Immanuel_Velikovsky 

https://en.wikipedia.org/wiki/Vulcan_(hypothetical_planet)