Giant Spiders on Mars!

Article written: 16 Nov , 2012
Updated: 26 Apr , 2016

Eek, spiders! All right, so it’s not actually little green arachnids we’re talking about here, but they are definitely spidery features. Called araneiform terrain, these clusters of radially-branching cracks in Mars’ south polar surface are the result of the progressing spring season, when warmer temperatures thaw subsurface CO2 ice.

As dry ice below the surface warms it can sublimate rapidly and burst through the frozen ground above, creating long cracks. If the material below is dark it can be carried upwards by the escaping gas, staining the surface.

Each dark splotch is around 100 meters wide.

This image was acquired by the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter on September 26, from a distance of 262 km (163.8 miles). See the full-size scan here, and check out more recent HiRISE images in the November PDS release here.

Credit: NASA/JPL/University of Arizona

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15 Responses

  1. Member
    Aqua4U says

    “…staining the surface…If the material below is dark” or blowing away the accumulated dust? Probably a combination of both? I wonder how stable the surface around these areas are.. i.e. not good for walking across? What is the resolution of this imagery – how big are the ‘spiders’?

  2. lcrowell says

    Next up, Ziggy Stardust!


  3. Tim Amato says

    Sombody step on them!

  4. Nice! I’m a HiView junky (when it doesn’t drop the data or crash) and I missed this mother image! Gonna go add more pics to my wallpaper slideshow folder now!

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