Giant troughs that stretch across the asteroid Vesta may have formed after a fellow asteroid smacked into Vesta's south pole, researchers say. These findings add to evidence that, like Earth, Vesta is ...

Catherine Weitz, a senior scientist at the Planetary Science Institute in Tucson, Arizona, 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 ...