Since 1998 a strange thing has been observed on the Martian surface. Every spring, as the sun rises, small spidery black marks emerge on the planet's surface, only to disappear as the weather turns. Take a look to see what they could be...
http://www.npr.org/blogs/krulwich/2012/10/02/162147810/are-those-spidery-black-things-on-mars-dangerous-yup
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