Instead, the Martian spiders are actually dark spots between 45 meters and one kilometer across, which have begun to appear as gas bursts free of the Martian surface in the springtime, bringing with it dark material from below the surface.

"This new view of Inca City and its hidden arachnid residents was captured by Mars Express’s High Resolution Stereo Camera," the ESA reported. Their spacecraft grabbed images of "everything from wind-sculpted ridges and grooves to sinkholes on the flanks of colossal volcanoes to impact craters,

Mars' Inca City, formally known as Angustus Labyrinthus, exhibits a linear, almost geometric network of ridges like the Inca ruins on Earth. It is part of a circular feature appro