[ExI] What if Planet 9 is a Primordial Black Hole?

[John Clark]

Due to the odd orbits of recently discovered Trans-Neptunian objects
astronomers say that, unless it's just a very unlikely coincidence, there
is probably a unknown planet between 5 and 15 earth masses orbiting the sun
between 300 and 1000 times as distant from the sun as earth's orbit is, but
other than this indirect evidence optical telescopes have been unable to
find the slightest trace of it. A new paper suggests that the reason it's
so hard to find is that the gravitational mass may not be a planet at all
but is a Primordial Black Hole about the size of your fist, and says we
need to look for it with a Gamma Ray Telescope not the optical sort.

What if Planet 9 is a Primordial Black Hole?
<https://arxiv.org/pdf/1909.11090.pdf>

The Optical Gravitational Lensing Experiment has detected ultra short micro
lezing events caused by gravitational masses in the same range in the
distant Magellanic  Cloud (a dwarf galaxy) that they assume were caused by
free floating planets not connected to any star, but perhaps it was caused
by something even more exotic like a Primordial  Black Hole.

Optical Gravitational Lensing Experiment
<https://en.wikipedia.org/wiki/Optical_Gravitational_Lensing_Experiment>

It's probably just a boring planet but maybe not, it would be GREAT if it
turned out to be true, we could actually sent a robot spacecraft to explore
a BlacK Hole, and if it used the sun grazing "Goddard orbit" to boost its
speed it could get there in less than a decade.

John K Clark
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