See Tyagaraja's Etchings: Nasa Messenger Mission Date presented 29 Sept 2011

Date Presented: September 29, 2011, at a NASA Press Briefing Instrument: The Mercury Dual Imaging System (MDIS) Of Interest: Tyagaraja is a large (97-km diameter) impact crater whose floor is partially covered by large numbers of coalesced hollows, giving the terrain an etched appearance. Here a high-resolution monochrome image has been combined with a lower-resolution enhanced-color image. The hollows appear in cyan, a result of their high reflectance and bluish color relative to other parts of the planet. The large pit in the center of the crater may be a volcanic vent, from which the orange material erupted.

Credit: Courtesy AAAS/Science