Say cheese! Mars' 'Happy Face' crater has significantly grown over a decade due to thermal erosion
Studying the face is more than just a diversion, though. The 'Happy Face' crater snapped by HiRISE on December 13, 2020. Monitoring features like this 'helps us understand longer term climate trends on the Red Planet,' says researcher Ross Beyer 'Measuring these changes throughout the Martian year help scientists understand the annual deposition and removal of polar frost,' Beyer said. 'And monitoring these sites over long periods helps us understand longer term climate trends on the Red Planet.' The smile on the figure appears larger because of how much frost has been lost to thermal e...