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12 NOV. 2010
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They say you can’t judge a book by its cover but, with planets, first impressions do count. New images show where complex fault lines in Mars’ Phoenicis Lacus region have resulted in terrain with a distinctly contrasting appearance.
Nineteenth-century astronomers were the first to see Phoenicis Lacus on Mars. They identified it as a dark spot, and thought that it resembled a sea. Now we know that it is not a body of water but the southwestern extension of the complex Noctis Labyrinthus system, which stretches away from the giant volcanoes of Mars’s Tharsis region.
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Phoenicis Lacus shown in context
The brightness of a surface feature is still the first thing planetary astronomers notice. It is known as the albedo and is partly determined by the composition of the surface material. For example, ice is more reflective than rock. The texture of the surface also plays a part, with rough surfaces reflecting less sunlight and so appearing darker than smooth surfaces.
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Elevation of Phoenicis Lacus region
Phoenicis Lacus has an area of 8100 sq km (59.5 x 136 km), which corresponds to the size of Corsica. Only a small portion of it appears in this image, which was obtained on 31 July 2010 using the High-Resolution Stereo Camera (HRSC) on ESA’s Mars Express spacecraft.
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Phoenicis Lacus perspective view
Phoenicis Lacus was formed by the uplift of the Tharsis plateau. The continual episodes of strong volcanic activity in Tharsis not only lifted the plateau, but also deformed Phoenicis Lacus, creating blocks and multiple fault lines at different orientations. Extension has taken place here, resulting in this characteristic ‘horst-and-graben’ (cliffs and valleys) landscape.
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Phoenicis Lacus perspective view
A prominent collapse feature in this region is also visible. It shows as a long pit and sinks to a depth of about 3 km below the surrounding plains. Its walls give a glimpse of extensive basalt layers and a small field of sand dunes covers the floor.
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Features in Phoenicis Lacus
An impact crater can be seen on the left of the image. It was elongated during the spreading of the graben and evolved from a circular to an ellipsoidal form.
The other large bowl-shaped structures in this image do not have distinct rims like impact craters, so they are most likely collapsed structures.
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Phoenicis Lacus in high resolution
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Phoenicis Lacus in 3D
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Traces of Martian life
Mars Express close flybys of martian moon Phobos
Mars Express has returned images from the Phobos flyby of 9 January 2011. Mars Express passed Mars’ largest moon at a distance of 100km.
Wind and water have shaped Schiaparelli on Mars
The small crater embedded in the northwestern rim of the Schiaparelli impact basin features prominently in this new image from ESA’s Mars Express. All around is evidence for past water and the great martian winds that periodically blow.
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Related links
HRSC at DLR
Behind the lens...
This is the camera behind the stunning European imagery from Mars. The High Resolution Stereo Camera on ESA’s Mars Express is now mapping most of the Martian surface with unprecedented detail.
Mars Express HRSC images Frequently Asked Questions (FAQs)
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ESA Planetary Science archive (PSA)
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