At this time I believe it to be the most fascinating pursuit in the exploration of space. 10th for those of you who like to count Pluto.

LOTS of real evidence for this new planet... none of it confirmed.
There are, of course, inquiries into deep space AS incredible but they are far more 'iffy', for lack of a better word. The 9th planet, IMO, is more within our grasp of discovering.
and just to add.... something, (perhaps a comet), is entering our solar system hailing from deep space....as we speak, (or rather type). This is a very recent discovery. It's "may" be possible that when it nears earth we could scrutinize it and take a big leap forward in understanding objects outside of our solar system.