a fluvial valley ?

• by dunay

  whats your oppinion?

  Posted January 28, 2016 5:51 PM

• by mschwamb scientist, translator in response to dunay's comment.

  Hi,

  Nicely spotted. It does look like it's possibly from a river but the channels actually aren't carved by water but by carbon dioxide gas . learn more at http://planetfour.org/#/about

  Cheers,

  ~Meg

  Posted January 29, 2016 3:52 PM