David Bromage wrote in
:

Martin Dunne wrote:
It's certainly very unusual, but I like the reasoning! The problem
isn't just one of origin, although that makes it really unlikely.
It's tidal force, bit of a misnomer as there's no such force, just
the observation off the back of this planet's oceans that gravity
pulls slightly more on the forward side of a facing object. When
dealing with gravity of this order this translates into a lot of
disproportionate pull.

And not on the ocean (there wasn't any) but on the rock, such that the
planet would be distorted to the extent that a Mt Everest could be
pulled up on the side closest to the black hole every rotation. The
friction alone would guarantee that there would be little if any solid
crust and the surface of the planet would be akin to our mantle.

Also the orbital period of a planet that close would be measured in
hours rather than days, weeks or months.


Doesn't Jupiter's moon Io has active volcanoes because of tidal forces
from Jupiter's gravity? If that's case, how would a planet around a
black hole survive for long? Or at least, it may be able to have a solid
surface.