Mars’ atmosphere swelled like a balloon when solar wind stopped blowing. Scientists are thrilled

Mars’ atmosphere, once as thick as if not thicker than Earth’s today, is leaking into space.

About 0.25 lbs of Mars’ atmosphere (0.11 kg) is pushed away every second by the incessant solar wind, the speedy stream of charged particles routinely blasted from the sun which pervade the solar system and even reach beyond Pluto.