Photo + Story - What is this Martian mystery?

[OhauitiWeather]

What created this unusual hole in Mars?  The hole was discovered by chance on images of the dusty slopes of Mars' Pavonis Mons volcano taken by the HiRISE instrument aboard the robotic Mars Reconnaissance Orbiter currently circling Mars, according to Nasa.



What created this unusual hole in Mars? Scientists are investigating it as a possible spot for life on the Red Planet. Photo / Nasa

The hole appears to be an opening to an underground cavern, partly illuminated on the image right.

Analysis of this and follow-up images revealed the opening to be about 35 meters across, while the interior shadow angle indicates that the underlying cavern is roughly 20 meters deep. Why there is a circular crater surrounding this hole remains a topic of speculation, as is the full extent of the underlying cavern.

Holes such as this are of particular interest because their interior caves are relatively protected from the harsh surface of Mars, making them relatively good candidates to contain Martian life, Nasa reports.

These pits are therefore prime targets for possible future spacecraft, robots, and even human interplanetary explorers.
 

- nzherald.co.nz
http://www.weatherwatch.co.nz/content/photo-story-what-martian-mystery

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[Weather Display]

looks like a sort of sink hole?
might have been some water running underneath to cause that?

[Deano]

Some of the earlier scans have found other holes also.
http://www.space.com/3632-mars-caves-targets-search-life.html
Here are some pictures from space.com