Today's APOD features a Sinuous Lobate Scarp that "snakes" across the Floor of the Mercurian Sinan Crater. Sinan Crater is an old and highly degraded Impact Crater, approx- 134 Km (such as approx. 83,214 miles) in diameter. Sinan's Rim and Peak Ring Mountains have been worn down (---> destroyed, highly damaged) by countless old impacts, while the Basin has also been profoundly modified (from its original shape) by several large and younger impacts. If you pay real attention, you will be able to notice that small Hollows dot parts of the Northern Rim, Lobate Scarp, Peak Ring, and - of course - the Floor of Sinan Crater. Date acquired: October, 29th, 2011 This picture (which is an Original NASA - MESSENGER Spacecraft's b/w and Map-Projected image published on the NASA - Planetary Photojournal with the ID n. PIA 18984) has been additionally processed, contrast enhanced, Gamma corrected, magnified to aid the visibility of the details and then colorized in Absolute Natural Colors (such as the colors that a human eye would actually perceive if someone were onboard the NASA - MESSENGER Spacecraft and then looked outside, towards the Surface of Mercury), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team. Different colors, as well as different shades of the same color, mean, among other things, the existence of different Elements (Minerals) present on the Surface of Mercury, each having a different Albedo (---> Reflectivity) and Chemical Composition. |