I saw this article, and immediately cringed - the good ol' mainstream press can't report this story without a bit of conspiracy / catastrophe theory thrown in - the headline gives you a taste of what is to follow:
NASA admits the mysterious Planet Nine is real, but says ‘deadly’ Nibiru is a fraud
A bit further on, it gets much scarier:
However, it’s feared Planet Nine will eventually destroy the solar system by causing a devastating “death dance”.
It could one day hurtle through our solar system, sending planets “pinballing” into outer space or plunging into the Sun.
Woah - this is terrible! Is it time to say goodbye to family and friends?!
Perhaps not just yet:
Luckily for us, humanity has about seven billion years to prepare for this grim eventuality, which will take place when the Sun begins to die.
I'd suggest you go to the source JPL story for a less sensational account of the science:
https://www.jpl.nasa.gov/news/news.php?release=2017-259