Recently engaged in providing support to the successful landing of NASA's Mars Science Laboratory's Curiosity rover, ESA's Mars Express has now returned to its primary mission of studying the diverse geology and atmosphere of the 'Red Planet' from orbit. Earlier this year, the spacecraft observed the 120 km wide Hadley Crater, providing a tantalizing insight into the martian crust. The images show multiple subsequent impacts within the main crater wall, reaching depths of up to 2600 m below the surrounding surface....