Nibiru was captured by our solar system 290 million years ago.
If you will only read the book “Not by fire but by Ice”, you will learn what it is that killed the dinosaurs, it was not asteroids. While it is somewhat complicated the problem is Volcanoes. It is a little complicated but Robert Felix in the book referenced above does a convincing job of explaining how its happens. It has happened several times in the history of the earth, mass extinctions that is.
The destruction “theorized” by some from asteroids is just theory and there is very little evidence to support the theory. There is much evidence to the contrary and it is interesting reading about it. I do caution anyone reading the above book, you will become a global warming denier if you aren’t already.
While many of the clues of what happened in the past are duplicating themselves we don’t know what yet to expect in the near future but for sure the global warming nuts are just that, nuts.