Gravastar

Black holes got mass (so volume), spin (so shape), and maybe charge. Here's an alternative, in the too-heavy and simple file: the gravastar.

Best I can tell, these are bubbles, not singularity-with-eventhorizon. You'll still get torn to pieces, but the pieces will (eventually) fall upon the bubble surface. Which will increase the size of the bubble. The size and mass we're looking at, would be Middlesex (or "London") and ten suns. So a bit denser than the neutron-star.

Since there is a shell, and not a simple cutoff of "in universe" and "not in universe", it doesn't emit Hawking. It is dark.

Because the outer shell is so rigid it is also cold. It doesn't move. Shining a light on it would just add energy, to make it larger. Some EV light would bounce back but with very long wavelengths: so, blackbody curve skews to the radio, leaving little for infrared.

So far this is a theoretic entity, so it can't be distinguished from that other really small, really nonemissive heavy thing. Unless it crashes into that other thing. Which is what instruments are now looking into.

BACKDATE 12/11