TIME Magazineのインスタグラム(time) - 2月24日 04時58分

There was plenty of reason to celebrate when the Perseverance rover successfully touched down in Mars’s Jezero Crater on Feb. 18. But in some ways, the rover showed up too late—3.5 billion years too late, in fact. Long ago, in an earlier epoch, as studies of Mars have shown, Jezero Crater was Jezero Lake, a 45 km (28 mi.) depression in the northern Martian hemisphere, writes Jeffrey Kluger. Not long after, however, Mars lost its magnetic field and thus 99% of its atmosphere and nearly all of its water, transforming the planet into the frigid desert it is today. The rover’s mission is set to last at least one Martian year—or two Earth years. But if Perseverance is anything like its sister rover Curiosity, which was landed on Mars in 2012, was also pegged for just two Earth years and is still hard at work, it could exceed that minimal mission by a decade or more. What Perseverance will discover in that time is impossible to know. What it could discover—signs or even proof of extraterrestrial life—is thrilling to imagine. Read more at the link in bio. Photograph by @NASA/JPL-Caltech/@reuters

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