Dark canyons.doc

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Dark canyons, black dunes and spirallingwhirlwinds: Satellite images reveal Mars'

incredible and varied landscape Images compiled by Paris-based Xavier Barral in his book

This is Mars They were taken by Nasas Mars Reconnaissance Orbiter

in 2006 Each image maintains consistent point of view covering a

6km wide area

By Ellie Zolfagharifard

A journey through Mars impressive landscape has been made possible th rougha series of incredible images that reveal its surface in unprecedented detail.

The images allow you to plummet into the breathtaking depths of its darkestcanyons, float over its black dunes and revel in the beauty of the red planetsspiralling whirlwinds.

They were taken by Nasas observation satellite Mars Reconnaissance Orbiter(MRO) and provide a previously unseen vision of Mars, whose landscape has

been taking shape for more than three billion years.
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Since 2006, the Mars Reconnaissance Orbiter has been charting the red planet's terrain. Thisimage shows defrosting of the crests of 'Inca City'. This is the informal name given to a set ofintersecting ridges that are located among the layered materials of the south polar region of Mars.Their origin has never been understood

Since its arrival in orbit in 2006, MRO and its High Resolution Imaging Science

Experiment (HiRISE) telescope have been mapping the martian surface.

The HiRISE team released preliminary, black-and-white images in March ofthat year, and have since collected hundreds more.

Now Xavier Barral has compiled a selection of these in his book This is Marswhich is designed to be a visual atlas of the red planet.


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Black-sand dunes on the floor of Mars' crater have been formed from cooled lava rock. This isone of the first sand dune fields ever recognised on Mars. In winter, these dunes are covered byfrost and CO2 ice


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The circular depressions, swirls and cliffs shown here are created by frozen CO2 on Marsevaporating into gas. The sun's sharp angle provides the energy that drives this process

As Francis Rocard, manager of Solar System Exploration at CNES SpaceObservatory points out: Along with Earth, Mars is the planet whose history isthe most rich and diverse.

In order to best capture the geological and mineralogical contours of thismythical planet, the team decided to maintain a consistent point of view, witheach photograph covering a 6-km wide strip.

Highlights include defrosting of the crests of Inca City - the informal namegiven by Mariner 9 scientists in 1972 to a set of intersecting, rectilinear ridgeson the south polar region of Mars.

Their origin on Mars has never been understood, but seems to be linked tovolcanic dykes.


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An impact crater reveals the layers of the Plateau Mawrth Vallis on the red planet. These layersare composed of clay minerals formed by the transformation of liquid water, providing evidenceof Mars's ancient, humid past


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Cuts into Mars' south pole sedimentary layer reveal that the area was made up of water ice, ratherthan frozen CO2. The cuts were made due to dramatic changes in temperature which can vary byas much as 100 C

A further image reveals black- sand dunes on the floor of Mars crater which

have been formed from cooled lava rock.

The image shows one of the first sand dune fields ever recognised on Mars. Inwinter, these dunes are covered by frost and CO2 ice and deprived of sunlight.

Another group of sand dunes is shown to be lit by the sun shining down directlyfrom above.

Last year, researchers found that sand dunes on Mars, once thought to beunchanging, are actually dynamic and active today.


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These canyons show the regions of Granicus and Tinjar Valles, lying at approximately 26.8degrees north latitude and 135.7 degrees east longitude. The northwest-aligned valles are Mar ofthe Utopia-Planitia region, an area thought to be covered by a layer of lava. Today, this once-smooth volcanic plain is incised by channels

Fast dunes can travel a distance equal to their length over 170 years .

The book takes you on a journey into the deep cuts of Mars south polesedimentary layer revealing that they are made up of water ice, rather thanfrozen CO2.

The cuts were made due to dramatic changes in temperature which can vary byas much as 100 C .


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Mars has vast glaciers hidden under aprons of rocky debris near mid and lower latitudes. In thisimage, the lines in the lower left largely parallel revealed the direction the glaciers flowed. Thefissures have similarities to those formed by Alpine glaciers

This image shows region of the Polar South formed in Spring and at the end of summer. Thedark patches shown fractures in the carbonic ice


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Mr Barral provides a captivating picture of how circular depressions, swirls andcliffs are created by frozen CO2 on Mars evaporating into gas.

He hopes these images will fuel our imagination, opening up multipleinterpretations and thus inciting us to think about our world and ourselves.

Scientists have long known that the red dust on Mars can swirl and blow around in dust stormsand small whirlwinds, dust devils. These whirlwinds can cover huge areas of the planet,spiralling random trajectories


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