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 ...

As NASA’s MESSENGER spacecraft prepares for its second flyby of Mercury, new analyses of data from the first flyby was presented at the European Planetary Science Congress in Münster September 23. Dr.