What Do Raindrops Look Like in Outer Space?

How Arizona’s Monsoons Got Me Chasing Storms on Titan

Lunine on Titan LEAD

Living in Tucson, Arizona—a Sonoran desert city surrounded by tall mountains—can make you obsess about rain. In 1993, I had just moved into a new office at the University of Arizona’s Lunar and Planetary Laboratory that had a floor-to-ceiling view of the 9,000-foot-high Catalina Mountains. I had a ringside seat to an art gallery of beautiful convective cloud towers, which send hot air up over the desert mountains on late summer afternoons. Rain was rare, but when it happened, it came in a torrent. It would soak the soil and …

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