Radiation risk from long Mars trips alarms researchers
A NASA funded assessment finds roundtrip Mars missions could expose astronauts to about 662 millisieverts, roughly the yearly full body CT dose every week for a year. This could raise cancer risk by about 3 percent though uncertainties remain about space environment effects.
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Martian Pebbles Point to Ancient Flowing Water
NASA's Curiosity rover found hundreds of smooth round pebbles in Gale Crater indicating a past fast moving stream. High resolution images and laser analysis suggest the stones were shaped by water ankle to waist deep, with findings published in Science Friday.
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