Our neighbor the Red Planet is not called Mars by chance, it is of course its red color clearly visible on thenaked from Earth, which earned him the name of the god of war in Rome (inherited from Babylon and Greece). So when two millennia after Caesar, from 1962 to 1971, Mariner probes first unveiled details of Mars the likes of which had never been seen before, revealing a desolate, dry world, and sporting a huge gash long up close of 4,000 kilometres, how not to think of the face of a wounded warrior. Named Valles Marineris in honor of Mariner 9 who made his discovery, this impressive wound by its dimensions is none other than the longest, widest and deepest canyon in the .
onwhich tore at this location billions of years ago, leaving a very spectacular indentation which ends in the west with a network of valleys, the Labyrinth of Night. Here, in these images taken by the venerable European space probe — she knows the Red Planet “like the back of her hand” since she has been flying over it for almost 20 years — we are not far from it, precisely to the east, in front of .
In the depths of Valles Marineris
On the walls of these two notches, one can observe the action of thewhich for billions of years has been the of this environment, patiently eroding it, unlike the on Earth (so much smaller), carved out by the Colorado River. Debris is piling up at the bottom, thousands of meters below. There, moreover, nothing is smooth or frozen too. There are many reliefs, of varying origins, such as mountains culminating at more than 3,000 meters, also streaked and plowed by the winds. Finally, reports the ESA, between these two mountains, there are bumps rich in « sulphates containing water »which keep the memory of the very old precious in these deep gorges in places of 7 kilometers.
Mars is a paradise forwho read on these images of and also from the fascinating past of this planet close to ours.
In pictures: visit the Hebes Chasma Canyon
Article ofpublished on October 17, 2013
Thanks to the images captured by the European space probe Mars Express (Esa), explore with an unequaled level of detail the reliefs of Hebes Chasma, a vast Martian canyon corroded by billions of years of erosion.
Thepresents a wide variety of landscapes with which we are increasingly familiar. Moreover, it is not rare to meet some which echo what we know on Earth: here , certainly giants, there valleys of debacles or dried up rivers. Without forgetting the canyons with disproportionate dimensions such as , the most famous of the solar system, which stretches over nearly 4,000 km. An impressive scar on the face of Mars, perfectly visible from space.
The region has several, all likely formed during the first billion years of the planet’s history. For exogeologists, their origin is to be found in the uprising of the titanic volcanoes of the group of dominated by the immense , 23 km high and as wide as France. Stretched, the Martian would then have broken, indented in multiple points. Billions of years after this geological episode, we discover these gaping wounds transformed by erosion, thanks to the cameras of the orbiters present on site.
The strange canyon of Hebes Chasma on Mars
About 300 km north of Valles Marineris is( above and below), another injury in the area. The canyon extends from east to west over some 315 km, and from north to south over 125 km, for a depth of nearly 8 km! Taking a closer look at the mosaic of eight highly detailed images, captured between 2004 and 2009 by the (High Resolution Stereo Camera) of the Mars Express probe, the scientists noted several interesting points.
The one that catches their attention the most is the long plateau, or mesa, remaining in the center of the depression whose summit is at the same altitude as the surrounding environment. The data acquired by MRO () of NASA and the European space probe show that its walls, apart from the materials of volcanic origin that are found buried throughout the region, are characterized by layers of sediments and are carpeted with dust spread and moved by the or various .
One of the curiosities of this damaged landscape is the horseshoe-shaped part, visible at one of its ends. On thefrom a collapsed wall, we can make out a long flow of dark material ending, below, in a strange puddle of black ink. It is not excluded that a sudden melting of ice or the effusion of underground reservoirs are the cause.
Impossible to miss the multiple furrows engraved on the slopes of the mesa, testimonies of the relative fragility of the rocks of the building. Their study revealed the presence of hydrated minerals, which only form in the sustained presence of. A lake probably occupied this deep depression for at least several thousand years before disappearing. Subject to the erosion of water and landslides, the canyon of Hebes Chasma continues to grow.