This image from the HiRISE camera on the Mars Reconaissance Orbiter, shows cracks in the rocks on Mars that once formed the underground plumbing through which groundwater traveled. Groundwater flow on Mars has been speculated for a long time, but it takes powerful cameras like HiRISE to actually find the evidence. These cracks resisted erosion because they were filled with minerals deposited by groundwater, so now we can see them … Continue reading Plumbing on Mars: HiRISE Reveals Groundwater Cracks