Every serious planetary scientist knows Mars will kill the first people we send there - and we're going anyway

Key Points:

• Sending humans to Mars poses significant, well-documented risks including exposure to high levels of cosmic radiation, which could increase mortality and serious health issues such as cancer and cardiovascular damage during the approximately three-year mission.
• Extended weightlessness and Mars’ low gravity are expected to cause severe bone density loss and muscle atrophy, with models predicting that all astronauts on long missions will develop osteopenia and many will risk osteoporosis, complicating physical activity upon arrival.
• Psychological challenges from prolonged isolation, confinement, and communication delays of up to 24 minutes each way are profound, with studies showing mood deterioration, sleep disturbances, and disengagement that could worsen without real-time Earth support.
• Despite unresolved engineering challenges and significant health risks, plans for crewed Mars missions continue, driven by a cultural and institutional acceptance of high-risk exploration, where volunteers knowingly face potential irreversible damage or death.
• The core question is not whether humanity should attempt Mars missions, but how society values the sacrifices involved and what it means to willingly accept substantial risks for the chance to explore and possibly inhabit another planet.