[Robert A Cook PE]

As long as they don’t make a bad movie about ... With a weird title like “Planet 9 From Outer Space.”

That would just be, like, out of this world.

[SunkenCiv]

Thanks RACPE. Virtual balloon bouquet for this ping of yours is (I think) your first to an astronomy topic. But hey, my memory is getting sucked into a black hole, so...

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Giant-planet Influence on the Collective Gravity of a Primordial Scattered Disk
A. Zderic, A. Madigan | Published 31 March 2020

Axisymmetric disks of high eccentricity, low mass bodies on near-Keplerian orbits are unstable to an out-of-plane buckling. This "inclination instability" exponentially grows the orbital inclinations, raises perihelia distances and clusters in argument of perihelion. Here we examine the instability in a massive primordial scattered disk including the orbit-averaged gravitational influence of the giant planets. We show that differential apsidal precession induced by the giant planets will suppress the inclination instability unless the primordial mass is $\gtrsim 20$ Earth masses. We also show that the instability should produce a "perihelion gap" at semi-major axes of hundreds of AU, as the orbits of the remnant population are more likely to have extremely large perihelion distances ... than intermediate values.