#PPOD: Here is another cool rock at Gale crater on Mars! The spikes are most likely the cemented fillings of ancient fractures in a sedimentary rock. The rest of the rock was made of softer material and was eroded away. 📷: @NASA@NASAJPL@Caltech#MSSS fredk, acquired on May 17. pic.twitter.com/RGfjmRBfI7
— The SETI Institute (@SETIInstitute) May 26, 2022