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More images and news from New Horizons. http://www.nytimes.com/2015/07/18/science/space/pluto-terrain-yields-big-surprises-in-new-horizons-images.html?smid=tw-nytimes&_r=0
Closer images of pluto cause concern to NASA scientists
Well, I wasn't limiting it to ice. Any crystalline structure with 6-fold symmetry is going to have natural fracture lines at 120 degrees. Bubbles (or other free-forming spherical shapes) will always meet at a 120-degree angle when three come into contact. There's also this interesting bit of synchronicity. Measuring by eye, the 137-degree angle doesn't look a whole lot different from a 120 degree angle.
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