Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior.
Arachnophobes need not fear: A new European Space Agency image of Martian"spiders" actually shows seasonal eruptions of carbon dioxide gas on the Red Planet.
The formations are actually channels of gas measuring 0.03 to 0.6 miles across. They originate when the weather starts to warm in the southern hemisphere during Martian spring, melting layers of carbon dioxide ice. The warmth causes the lowest layers of ice to turn to gas, or sublimate. Inca City is also known as Angustus Labyrinthus. It's named for its linear, ruin-like ridgelines, which were once thought to be petrified sand dunes or perhaps remnants of ancient Martian glaciers, which could have left high walls of sediment behind as they retreated.
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