Question Is there a 9th planet? If so, then how big, dense, and massive is it? What is its orbit around the sun and gravitational effect on the Solar System?

Does Planet 9 exist?

  • yes

  • no

  • probably

  • not sure

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Yeah, there's the hole in that theory. I will do some research though.
:) Nice pun, but not because a BH would hurt Neptune, but because a planetary mass BH evaporates too quickly. [IIRC]

The planets only orbit due to gravity and they don't care if the primary mass is fluffy or close to a singularity. Newton formalized the principle where the c.g. is at the center, after all.
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"Science begets knowledge, opinion ignorance.
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.

"Simulations have shown that Planet Nine causes the orientations of the ETNOs* orbits to cluster on timescales comparable to the age of our Solar System . . . . . . There are now on the order of a dozen ETNOs that appear to exhibit this clustering, and if you look at the data, this clustering appears to be rather robust."

In conclusion: "A new planet would be extremely cool, and it would solve a lot of anomalies that we don't understand about our Solar System . . . . . . But we have to entertain the possibility that there is no Planet Nine and continue searching for alternate explanations of these anomalies".
*Extreme Trans Neptunian Objects

Cat :)
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.
Couldn't you find a newer one? *wink* [Nice one!]

This model seems to match the one presented shortly after the time Mike Brown, et. al, introduced their theory for another planet. [ article here from 2017]

Ann-Marie Madigan, a postdoctoral researcher at the University of California Berkeley, found that the objects could "self-organize," pushing and pulling one another into their unusual orbits.

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.
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Another interesting development that seems to have gone unnoticed, assuming I understand what happened, is the N-body orbiting calculus has been established.

A recent Star Date mag. article was about the discovery of a third body using a broken radar system. [The track was broken that allowed the disk's movement.] So they used the radar (fixed) anyway and found three bodies in tight orbits. She (I forgot her name but it begins with "A" ;)) had some math background and interest to develop a full solution to N-body math. Thus, the use of iterations may be something of the past. I'm not absolutely sure this is correct, but I think it is, and it's a big deal, IMO.

If so, then perhaps it will tweak what is needed in this case.
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May 3, 2021
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As noted above, not necessarily. That is why sources matter. Relying upon YT, there should be little green men all over the place, too.
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)
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