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Cassini Turns the Spotlight on Saturn's Phoebe

New images of Saturn's outer moon Phoebe reveal a complex and puzzling chunk of ice and rock that was likely leftover from the beginnings of the solar system.

NASA's Cassini spacecraft snapped the images a little over a week ago as it neared its main destination, Saturn. The probe will soon begin a four-year mission to explore the dazzling ringed planet and many of its 31 moons, including the biggest, Titan.

Before Cassini's June 11 flyby, astronomers didn't know much about Phoebe. They knew it was in a distant orbit around Saturn and traveling in the opposite direction from the planet's other moons. They also knew it was round, lumpy and contained some water ice. But as NPR's Richard Harris reports, the findings released today show that Phoebe isn't just an asteroid captured by Saturn's gravity eons ago, but a geologically complex and interesting moon.

Copyright 2022 NPR. To see more, visit https://www.npr.org.

Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.