Who made these circles in the Sahara?

[netllama]

Thanks for posting that video. It was a lot of fun to watch. Always interesting to trace back some evidence of humans to try to figure out what one is seeing. And from a satellite, no less.

To come back to DV, note how hard it was to find the circles on the ground. Once they saw them, it was obvious off course, but from a few hundred meters away, not visible. If you ever head out into the salt flats to look for the "borax haystacks", I strongly advise first looking at the satellite images, on which they are quite visible, and taking a few waypoints on your GPS. Similarly, most of them are pretty flat by now, and hard to see until you're real close to them.

Indeed that's an excellent point. Also reinforces how long it takes for the desert to recover from man made changes. Those circles were created over 60 years ago, yet were still visible from space.