SPITTING IMAGE Simulated collisions between two moonlets can lead to oddly shaped moons (bottom row) that closely resemble some of Saturn’s moons (top row; from left to right: Pan, Atlas and Prometheus).
Images: JPL-Caltech/NASA, Space Science Institute; Simulations: A. Leleu, M. Jutzi and M. Rubin/Nature Astronomy 2018
NEXT STOP China’s relay satellite will support a future mission to the farside of the moon, photographed here in 2014 by an earlier Chinese satellite called Chang’e-5T1.
Chinese National Space Administration
HIDDEN DEPTHS Evidence is growing that plumes of water erupt through the icy surface of Jupiter’s moon Europa, seen in this composite image taken by the Galileo spacecraft in the late 1990s.