[dangus]

Fascinating!

The observations which led Shklovsly to theorize that it was jollow proved to be inaccurate; the altitude loss was less than initially calculated, and the new loss rate is entirely consistent with a solid body.

But Phobos isn’t solid! 1/3 its volume is empty space! It’s actually a porous conglomerate.

[varmintman]

The claim I've read in a number of places is that Russian probes have scanned the thing with penetrating radar and determined that it has rectangular interior spaces.

If we let anybody beat us to this one, we will be a scientific and technological backwater for the next five hundred years.

[varmintman]

The HIRISE image with the colors choked down to blue:

http://www.abovetopsecret.com/forum/thread313925/pg35