[/caption] The 68-mile (109-km) -wide Amaral crater on Mercury reveals its brightly-tipped central peaks in this image, acquired by NASA’s MESSENGER spacecraft on Feb. 4, 2012. Long shadows are cast by the crater’s peaks and rugged rim (north is to the left.) The image was acquired as a high-resolution targeted observation with MESSENGER’s Narrow-Angle Camera (NAC) … Continue reading Bright Peaks, Dark Shadows