Pumice-like rafts of lightweight material could have carried volcanic debris across an ancient Martian ocean to build one of the most puzzling features on the Red Planet.
Comparative planetology
Posted inEditors' Vox
Revisiting Enigmatic Martian Slope Streaks
Slope streaks of different sizes and shapes are a common feature on the surface of Mars, but scientists disagree about the mechanisms for their formation and development.
Posted inResearch Spotlights
Unprecedented Views of Mercury Constrain Hollow Formation
The consistently shallow depths of the depressions scattered across Mercury's surface suggest their morphology is not determined by the thickness of a volatile-rich outer layer.
Posted inScience Updates
Comparing Planetary Climates to Investigate Climate Systems
Comparative Climates of Terrestrial Planets II (CCTP2 ): Understanding How Climate Systems Work; Moffett Field, California, 8–11 September 2015