It's expected that earth's magnetic polarity has reversed about 170 times during the last 76 million years[1]. I remember hearing a hypothesis that Mars could h

It's expected that earth's magnetic polarity has reversed about 170 times during the last 76 million years[1]. I remember hearing a hypothesis that Mars could have lost its atmosphere due magnetic polarity reversal in some TV documentary for what its worth. [1]NASA : https://image.gsfc.nasa.gov/poetry/tour/AAmag.html https://image.gsfc.nasa.gov/poetry/tour/AAmag.html