Beyond the Rockets: Prioritizing Human Health for Lunar and Martian Exploration While the Artemis program focuses on technological advancements for lunar and Martian missions, this article emphasizes the critical need to understand and address the physiological and psychological challenges faced by astronauts, particularly concerning gravity and radiation exposure, to ensure the long-term success of human space exploration. The Artemis program, a bold initiative aiming to return humans to the Moon and eventually venture to Mars, understandably captures public attention with its impressive spacecraft and ambitious timelines. However, amidst the excitement surrounding rocket tests and lunar lander development, such as the upcoming test flight scheduled for 2027 and the planned lunar landing in 2028, it is crucial to remember the program's most vital component: its people. For 65 years, humanity has been venturing into the cosmos, a journey that began with Yuri Gagarin's historic 108-minute flight in 1961. Back then, the physiological effects of space on the human body were largely unknown. A test with a dog named Laika in 1957 had provided some confidence that space was survivable, but fundamental questions remained about how essential biological functions would operate in the absence of gravity. Gagarin's simple act of squeezing food from a tube and noting that swallowing was possible, just before his pencil floated away, highlights the early challenges and the nascent understanding of human adaptation to space. Since Gagarin's pioneering voyage, approximately 800 individuals have traveled to space, with 28 having journeyed to or around the Moon. The International Space Station (ISS) has maintained a continuous human presence for 26 years, with crews regularly undertaking missions of six months or longer. Some astronauts have even spent as much as a year in space, with Valeri Polyakov holding the record for the longest continuous mission at 437 days aboard the Russian space station Mir. This extensive human presence has fostered the development of space medicine, a dedicated field of study. Yet, despite this progress, significant knowledge gaps persist regarding the experiences and impacts of space conditions on individuals stationed on a lunar base or a Martian outpost. One of the most pressing unknowns revolves around gravity. The weightlessness, or microgravity, experienced on the ISS and spacecraft like the Orion capsule differs significantly from the partial gravity environments of the Moon and Mars. The Moon exerts one-sixth of Earth's gravity, while Mars possesses about one-third. Prolonged exposure to weightlessness leads to muscle and bone weakening and fluid redistribution within the body, potentially causing conditions like anemia and blurred vision. The long-term effects of partial gravity on these physiological processes are not well understood, as the longest recorded stay in such conditions was a mere three days on the Moon. Radiation presents another formidable challenge. While astronauts in low Earth orbit, such as on the ISS, are exposed to radiation levels up to 100 times higher than on Earth's surface, they are afforded a degree of protection by Earth's atmosphere and magnetic field, which deflects harmful solar and cosmic rays. The Van Allen radiation belts, extending beyond low Earth orbit, also offer some shielding. However, the Moon lies beyond these protective belts and lacks its own magnetic field, exposing its surface to two to three times more radiation than encountered in low Earth orbit. Understanding the combined effects of this increased radiation and partial lunar gravity on human health is paramount for the success of NASA's future plans. Preliminary insights may emerge from experiments like AVATAR, conducted during the Artemis II mission. This experiment involved culturing cells from the four crew members and keeping them alive within the Orion capsule. By comparing these cells with identical ones that remained on Earth, researchers aim to detect any radiation-induced effects. Future missions could employ similar bio-monitoring devices to assess human health risks without the immediate need to send astronauts, paving the way for safer and more informed long-duration space exploration