The reason space missions need artificial gravity is clear: humans simply did not evolve to live in zero gravity.
This quote highlights a fundamental challenge in human space exploration — our bodies are inherently adapted to Earth's gravity. Prolonged exposure to zero gravity can lead to muscle atrophy, bone density loss, and other health issues. Artificial gravity could be a crucial innovation for future long-duration missions, enabling astronauts to maintain their health and well-being. It emphasizes the importance of designing space habitats that mimic Earth’s conditions to support human longevity beyond our planet. As we venture further into the cosmos, understanding and overcoming these biological hurdles remains vital for our survival and success.