Wednesday, August 13, 2014
Hebes Chasma on Mars.
Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Inside Hebes Chasma is Hebes Mensa, a 3-mile-high mesa that appears to have undergone an unusual partial collapse.
This image, taken by the Mars Express spacecraft, shows that material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. A recent hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.