A recent study in rats has shed light on the potential health risks faced by astronauts on long-term missions to Mars. The research, published in the journal PLOS One, found that rats exposed to radiation levels similar to those experienced by astronauts on a trip to Mars developed more scar tissue around their heart's small blood vessels. This scarring is indicative of cardiac fibrosis, a condition that increases the risk of heart failure. The study's findings suggest that astronauts may be at risk of developing cardiac disease years after their exposure to space radiation. The researchers used NASA's Simulated Galactic Cosmic Ray Simulation to expose the rats to radiation levels similar to those experienced by astronauts on a mission to Mars. The rats were then monitored for nearly a year to observe the effects of the radiation on their hearts. The study's lead author, John Baker, a professor of surgery at the Medical College of Wisconsin, emphasized the importance of long-term follow-up care for astronauts after their return to Earth. He noted that astronauts may not develop cardiac disease immediately, but the effects of radiation exposure could become apparent years later. The study highlights the need for further research into the effects of space radiation on the human body and the importance of monitoring astronauts' health after their return to Earth.