Nice pun, but not because a BH would hurt Neptune, but because a planetary mass BH evaporates too quickly. [IIRC]Yeah, there's the hole in that theory. I will do some research though.
Yes and what was considered to be a persuasive scientific claim has fizzled, somewhat, as a result from recent work, apparently. [Article here.] [and a paper here from last year]To my knowledge, there is no proof of a ninth planet beyond Neptune. A ninth planet MAY explain some observations, but it is far from conclusive.
Don't believe everything on YT. The site is not known for being the bastion of accuracy.I don't have a link, but you can search "ninth planet" and also, the forum question is "Is there a ninth planet, if so, what do you think it looks like?"
Couldn't you find a newer one? *wink* [Nice one!]For anyone interested in magazine opinions, there is an article "Is there a Planet Nine" by David Crookes in: All About Space, Issue 116, May 2021.
Both models, of course, presented predictions that could be tested. I don't know the results of those tests but perhaps she was on the right trail after all.
The channel I got my information from is scientific, and I only believe the most reasonable channels, such as, riddle, unveiled, and what if. (what if is theoretical possibilities)As noted above, not necessarily. That is why sources matter. Relying upon YT, there should be little green men all over the place, too.