From a research station operated by the National Science Foundation called Summit Camp, a spot where the ice sheet is about 2 miles thick, GROVER will crawl at an average speed of 1.2 mph (2 kilometers per hour).

ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)

"If you looked at it and felt it you wouldn't be able to spot the difference between it and a sheet of paper, " says Skilhagen.

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