![](https://www.nasa.gov/sites/default/files/thumbnails/image/pia20661_hires.jpg)
Just by determining how circular a given crater is – using pi and the crater’s perimeter and area – planetary geologists can reveal clues about how the crater was formed and the surface that was impacted. via NASA http://ift.tt/2IncexY
The blue tentacle-like arms containing gecko-like adhesive pads, attached to an Astrobee robotic free-flyer, reach out and grapple a "...
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