The guardian The discovery, he says, “rekindled fears that space exploration threatens to pollute pristine Martian and lunar environments,” an issue addressed by the 1967 Outer Space Treaty, which some say does not go far enough to protect space environments. However, according to one expert, the risk of contamination is low because “everything is sterilized before it goes to Mars”. for every Mashable The rover hasn’t had “time to admire the litter” as it is now heading to its “peak of mission”, exploring a long-dry river delta at Jezero Crater, which may have been an aquatic environment capable of supporting microbial life about 3 billion years ago. (Read more perseverance stories.)