You know scientist have found Atlantis and it sank for a tsunami also they found a couple other ancient city's that sunk because of human ignorance
That link leads to a website full of doomsday scenarios. There is a page about Planet X, look for it. You can read it if you want, but you don't have to, since I'm basically going to summarize scientific reasons why Planet X is impossible.
1. The laws of physics prevent an object with the supposed mass of Planet X to orbit around the sun in the same way as a comet. Even if it could, it would eventually become apart of the same kind of orbit Earth and all the other planets follow.
2. Nibiru doesn't mean what Planet X doomsayers believe they are. It means ferry boat in Sumerian. And as for the Babylonians? They sometimes used the word to describe the movement of Jupiter, or Marduck as it was also referred to. So Nibiru is nothing more than another way to say Jupiter.
3. One man (Zecharia Sitchin) managed to mix up the word of ancient civilizations and accidentally came up with a doomsday prophecy when, in fact, such a thing was never predicted. In fact, both the Sumerians and the Babylonians thought the Earth was a disk, and there for astronomically ignorant. If they couldn't figure out the Earth was round, how could they ever predict the end of the world via a large celestial body?
4. Mathematically, Planet X cannot exist. If Planet X is coming in 2012 like people think it will, and if Planet X comes around ever 3600 years like I've heard it does, then we wouldn't be alive right now. 3600 years before the year 2012, humans were already on the face oft he Earth. In the Year 1588 B.C., the year when Planet X would have passed us by, there were plenty of civilizations running around before and after this year. During the entire 16th century B.C., there was the Fifteenth through eighteenth dynasties of Egypt, the Shang Dynasty of China, the First dynasty of Babylon, the Vedic civilization of India, the Mayas, the Greek, the Mycenaean, as well as many others. And they all lived through the year 1588 B.C. Furthermore, none of them have left any known mention of any strange events, so it is obvious that even if Planet X does exist, it has a much wider time frame than 3600 years.
More will be added when convenient. You may also post your proof of Planet X so I can make a number about how you're wrong.