PSI: Catherine Weitz, a senior scientist at the Tucson-based Planetary Science Institute, has reported new evidence for multiple, water-related geologic processes on Mars. She and her colleagues ...

Erosion-carved troughs that grow and branch during multiple Martian years may be infant versions of larger features known as Martian “spiders,” which are radially patterned channels found only in the ...

Scientists explored the Escanaba Trough, a deep sea area. Underwater vehicles mapped the seafloor and studied geological activity. They discovered hydrothermal vents releasing hot, metal-rich fluids.