The NASA/ESA Mars Sample Return mission has been canceled

Commenters reacted to the cancellation of the NASA/ESA Mars Sample Return mission with a mix of disappointment, frustration and guarded optimism. Several remarked that Perseverance’s Jezero samples - seen by some as the closest thing to potential biosignatures - are now unlikely to reach Earth soon, and they lamented the loss of scientific opportunity. Others pointed out parallel and future efforts: China’s Tianwen-3 and Japan’s Phobos sample missions were cited as possible alternative returners, and some hoped private companies or revived proposals (e.g., Rocket Lab) could pick up the effort. People who worked on related programs noted long delays for ExoMars/Rosalind Franklin and expected MSR to be revived eventually.

Opinion divided sharply over whether cancellation is sensible. Some commenters argued the mission is prohibitively expensive and technically painful - citing the rocket-equation difficulty of launching from Mars, autonomous Martian ascent, and an $11B price tag - while others blamed political choices and alleged anti-science priorities in the administration. A contingent maintained that we already have dozens of Martian meteorite samples on Earth, reducing MSR’s marginal value, whereas proponents emphasized that carefully curated Jezero cores would be far higher scientific quality. Debate also touched on engineering choices (dropping samples vs storing them, use of helicopters), the role of international cooperation, and skepticism about commercial space mining.