What is the popular opinion on this "Planet X" news that I have been seeing? It makes me a little nervous sometimes... I read so much on the internet about this subject and do not know what to believe... Can anyone help?
There's nothing to be worried about. There's no magical Niburu or Planet X, if anything then Planet 9 might exist. There was a recent research paper that looked at the orbital elements of some trans-Neptunian objects and their curious clustering. The paper suggested that a possbile explanation for this clustering might be shepherding by a possible ninth planet in the solar system.
Then the media made up big stories about magical objects in the sky that have nothing to do with Planet 9. Also I believe this question rather belongs into the astronomy section.