A unique phenomenon that could be mistaken for spiders scuttling across the planet's surface has been spotted on Mars, according to the European Space Agency.The ESA said in a news release that one of its Mars Express orbiter captured images of the "spiders," which are really just small, dark-colored features that begin to be formed when sunshine falls on carbon dioxide deposited during the planet's winter months. The light causes the carbon dioxide ice at the bottom of the deposits to turn into... Read this story
