[Steely Tom]

A mysterious circular rock formation on the surface of Mars has been captured by one of NASA's Orbiters. The formation was photographed by the Curiosity Rover this week...

If that picture was made by the Mars Orbiter, it could be 50 miles across.

If it was made by Curiosity, it could be 50 inches across.

[Steve_Seattle]

The more I look at it, I think the scale is just a few feet; many of those objects look like individual pieces of rock or pebbles, not rock formations.