---
title: "Space Radiation May Cause Heart Scarring in Astronauts"
url: https://newscentral.site/space-radiation-may-cause-heart-scarring-in-astronauts/
language: en
publisher: "News Central Site"
section: "Science"
published: 2026-11-03T11:40:35.000Z
updated: 2026-11-04T09:32:31.264Z
id: 710e2029-f9ab-485a-b71b-df2cefde5108
source: "Live Science https://www.livescience.com/space/space-exploration/cosmic-rays-could-scar-the-heart-raising-risks-for-mars-bound-astronauts-rat-study-hints"
attribution: "Link to https://newscentral.site/space-radiation-may-cause-heart-scarring-in-astronauts/ and name News Central Site when you quote or summarize this story."
---

# Space Radiation May Cause Heart Scarring in Astronauts

A new study suggests that exposure to space radiation on a trip to Mars could lead to heart scarring in astronauts, potentially increasing their risk of heart failure.

Researchers found that rats exposed to levels of radiation similar to what an astronaut might experience on a long-term mission to the Red Planet developed more scar tissue around the small blood vessels of their hearts than those not exposed to this radiation. This build-up of scar tissue is indicative of cardiac fibrosis, a condition known to increase the risk of heart failure.

The study observed that nearly a year after exposure to radiation, rats showed signs of cardiac fibrosis, highlighting the potential long-term effects of space radiation on the cardiovascular system.

However, it's essential to note that this study was conducted in rats and cannot be directly applied to humans.

The long-term effects of space travel on astronauts' hearts are still not well understood, despite previous studies highlighting potential cardiac risks.

In a new study, researchers used NASA's Simulated Galactic Cosmic Ray Simulation (SimGCRSim) to mimic the levels of radiation that astronauts might experience during extended deep-space missions. This simulator allows for more precise comparisons of space radiation exposure than earlier methods.

The study involved exposing rats to several minutes of radiation equivalent to what they would encounter on a trip to Mars and back, taking into account their size. The researchers used this simulated environment to assess the impact of prolonged space radiation exposure on the animals' hearts.

This experimental approach aims to provide valuable insights into the potential cardiac effects of long-duration space travel, which could inform strategies for protecting astronauts' health during future missions to deep space.

The researchers used a rat model to simulate the effects of long-duration space travel on the heart, exposing some rats to cosmic radiation while others were subjected to simulated weightlessness but not radiation.

In this experiment, the rats exposed to cosmic radiation developed twice as much scar tissue around their hearts' small blood vessels compared to unexposed rats after 360 days. This buildup of scar tissue can cause the heart to become less efficient in relaxing and contracting, increasing the risk of heart failure.

The researchers found that only exposure to cosmic radiation, not simulated weightlessness, was responsible for the damaging effect on the heart. This suggests that cosmic radiation may be a significant factor to consider when planning long-duration space missions.

However, further analysis revealed that the rats exposed to both cosmic radiation and simulated weightlessness had lower levels of key immune cells. This finding implies that microgravity may also have an impact on long-term health beyond just cardiac effects.

The study's findings are seen as a valuable contribution to the field of space biology, according to experts who were not involved in the research.

Rats and humans share a significant amount of genetic information, with over 90% similarity, according to experts. This similarity is also reflected in their cardiac systems, which are remarkably similar despite the differences between the two species.

The study's findings have sparked interest in further research on the effects of chronic radiation exposure on heart function and other vital organs. The researchers hope that future experiments will provide valuable insights into how astronauts can be protected from the health risks associated with long-term space travel.

Future studies may explore the development of countermeasures such as providing astronauts with heart medications or improving shielding for spacecraft to mitigate the effects of radiation exposure, ultimately helping NASA prepare for extended missions.

---
Source: [Live Science](https://www.livescience.com/space/space-exploration/cosmic-rays-could-scar-the-heart-raising-risks-for-mars-bound-astronauts-rat-study-hints)  
Published by News Central Site: https://newscentral.site/space-radiation-may-cause-heart-scarring-in-astronauts/