'Yardangs' on Mars

Jul 27, 2004
Mars - yardangs

This image of 'yardangs’, features sculpted by wind-blown sand seen here near Olympus Mons on Mars, was obtained by the High Resolution Stereo Camera (HRSC) on board the ESA Mars Express spacecraft.

This image was taken during orbit 143 with a resolution of 20 metres per pixel. This scene shows a structure south of Olympus Mons, at 6° N latitude and 220° E longitude, which was probably formed by the action of the wind.
Loose sand fragments were transported by wind, and impacted on the bedrock, slowly removing parts of the surface, like a sand-blaster. If the winds blow in the same direction for a long enough period, ‘wind-lanes’, as shown in the picture, can occur. On Earth, the remnants of these features which have not been eroded away are called ‘yardangs’.

Where the surface consists of more resistant material, the force of the wind may not be strong enough to cause this sand-blasting. This might be the reason for the three flat regions (the first in the foreground on the left, and the others top right), which measure about 17 by 9 kilometres.

Source: ESA

Explore further: Space sex geckos at risk as Russia loses control of satellite

add to favorites email to friend print save as pdf

Related Stories

Forces of martian nature

Jul 11, 2014

The surface of Mars is pocked and scarred with giant impact craters and rocky ridges, as shown in this new image from ESA's Mars Express that borders the giant Hellas basin in the planet's southern hemisphere.The ...

Lava, not water, formed canyons on Mars

Jun 03, 2014

The canyon-like scars which line Mars' crust are seen by many as evidence for liquid water. But a study now suggests that a different kind of fluid – one much less hospitable to life – may actually have ...

Venus mountains create wave trains

Jan 22, 2014

(Phys.org) —The planet Venus is blanketed by high-level clouds. At visible wavelengths, individual cloud features are difficult to see, but observations made by instruments on ESA's Venus Express orbiter ...

Recommended for you

Satellite galaxies put astronomers in a spin

18 hours ago

An international team of researchers, led by astronomers at the Observatoire Astronomique de Strasbourg (CNRS/Université de Strasbourg), has studied 380 galaxies and shown that their small satellite galaxies almost always ...

Video: The diversity of habitable zones and the planets

18 hours ago

The field of exoplanets has rapidly expanded from the exclusivity of exoplanet detection to include exoplanet characterization. A key step towards this characterization is the determination of which planets occupy the Habitable ...

User comments : 0