Data gathered by NASA's Mars Reconnaissance Orbiter contains a record of the Red Planet's latest ice age, according to a study recently published in the journal Science.

Data gathered by NASA's Mars Reconnaissance Orbiter contains a record of the Red Planet's latest ice age, according to a study recently published in the journal Science. 
The radar images, from the north polar ice cap, confirm earlier models which suggested a glacial period that drew to a close some 400,000 years ago--and predictions about ice accumulation there since that period's end. 
According to a summary of the findings, "The researchers identified a boundary in the ice that extends across the ent