wrote:
Just looked. I don't see anything there that looks the slightest bit
unnatural. Can you mail whatever it is you're taking? It must be good stuff.

In Martin's defense, the Vallis Alpes graben is a pretty unusual for a
landform. I'm at a loss to find any Earth based analogue for a graben
that is that large and so well-defined. Are there any Earth grabens
that look like the Vallis Alpes when photographed from space? -
Canopus56