Astronomy Picture of the Day
October 24, 2014

Features of Sirenum Fossae
Features of Sirenum Fossae

Credits: NASA/JPL/Arizona State University (ASU) - Credits for the additional process. and color.: Dr Paolo C. Fienga/Lunar Explorer Italia/IPF

In this VIS image, taken by the NASA - Mars Odyssey Orbiter on September, 7th, 2014, and during its 56.477th orbit around the Red Planet, we can see that the Linear Depression vsible in the center of the frame is a Graben, and this one here crosses an Unnamed Impact Crater and its Ejecta Blanket - right in the middle of the image - so indicating that the Graben formed after the Impact Event which created the Crater.

Using the Geologic Terminology, a the Grabens are dropped or downthrown Areas relative to the Rocks on either side, and these Surface Features - very common on Mars - are generally longer than wide.

Latitude (centered): 36,522° South
Longitude (centered): 193,781° East
Instrument: VIS

This image (which is an Original Mars Odyssey Orbiter b/w and Map-Projected frame published on the NASA - Planetary Photojournal with the ID n. PIA 18754) has been additionally processed, magnified to aid the visibility of the details, contrast enhanced and sharpened, Gamma corrected and then colorized in Absolute Natural Colors (such as the colors that a normal human eye would actually perceive if someone were onboard the NASA - Mars Odyssey Orbiter and then looked down, towards the Surface of Mars), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.

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