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For most of the NASA robots on and around Mars, March 8, 2015 was just another Sunday. As the red planet continued its slow march around the sun, a burst of solar material buffeted the atmosphere. No big deal—such changes in solar weather are pretty common.
But for one orbiting probe, March 8 was a day of Martian history in the making.
NASA’s Mars Atmosphere and Volatile Evolution (MAVEN) mission was watching closely as the solar outburst stripped away some of the planet’s already thin atmosphere. Its observations back up scientists’ suspicions that solar activity is a major player in shaping Mars’s atmosphere, a finding that is even more exciting when viewed with an extremely patient eye.
That’s because billions of years ago, the young sun was thought to be much more active, spewing out solar storms more often and with more intensity than it…
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