Curious craters on Mars said result of impacts into ancient ice

August 5, 2013 8:28 PM

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PROVIDENCE, R.I., Aug. 5 (UPI) -- U.S. geologists say they've come up with a new explanation for a mysterious double-layer type of crater observed on Mars, and it's all about ice and impacts.

Impact craters on Mars are surrounded by what's known as ejecta, debris excavated by an impacting object.

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