Fox News correspondent DanaMarie McNicholl reports on the physiological changes astronauts experience during deep space travel, specifically focusing on the Artemis II mission. She details the effects of microgravity, including fluid shifts in the body that reduce the heart's workload and can temporarily make astronauts taller, and discusses the risks associated with deep space radiation and disrupted sleep cycles due to multiple sunrises and sunsets. Cardiologist Dr. Srinivas Prasad provides medical insights into these cardiovascular adaptations and the broader scientific benefits for life on Earth.