Something made a hole in Mars

NASA's Astronomy Picture of the Day this week gave an indication of how much there still is to explore just in our tiny corner of the universe.

NASA says the hole was discovered by chance on images of the dusty slopes of Mars' Pavonis Mons volcano by a reconnaissance orbiter currently circling Mars:

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

"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.

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

Continue reading at APOD: A Hole in Mars