Phobos starting to crack under pressure
Martian moon’s grooves are early signs of a long, slow crumble into oblivion
GROOVY MOON Grooves etched across Mars’ moon Phobos, seen in this 2004 picture from the Mars Express orbiter, are caused by a mix of stress fractures and impact debris, new studies suggest.
ESA, DLR, FU Berlin (CC BY-SA IGO 3.0)