[A hydrothermal system on #Mars] In the rocks bounding the Jezero impact crater, the #Pereverance rover's instrument array has detected the presence of #silica in various forms: opal, chalcedony and #quartz. Evidence of water-rock interaction dating back to the very beginning of the Red Planet's history ....
Knowing that siliceous rocks - opal in particular - have a remarkable ability to preserve traces of #life, all that remains is to sample these rocks and bring them back to Earth for further exobiological analysis.




