NASA planetary scientists say they have found evidence of past water movement throughout a Martian meteorite. This SEM image shows spheroidal features embedded in a layer of iddingsite, a mineral formed by action of water, in the Martian meteorite Yamato 000593: an area with the spheres, circled in red, was found to have about twice as much carbon present as an area without the spheres, circled in blue. The scale bar at lower left is 1 micron. Image...
