{
  "id": 9000086,
  "title": "Spaceflight may harm the reproductive system of astronauts' kids and grandkids, early mouse study suggests",
  "url": "https://urgent.news/2026/09/21/spaceflight-may-harm-the-reproductive-system-of-astronauts-kids-and",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-21T20:10:00.000Z",
  "source": {
    "name": "Live Science",
    "slug": "live-science",
    "url": "https://www.livescience.com/health/reproductive-health/spaceflight-may-harm-the-reproductive-system-of-astronauts-kids-and-grandkids-early-mouse-study-suggests"
  },
  "original_language": "en",
  "account": "Lab mice that spent time on the International Space Station (ISS) appear to have reduced reproductive capacity, with offspring experiencing smaller litters, fewer overall litters, and lower hormone levels, according to a recent study. While the study suggests potential risks for human astronauts and their descendants, the implications for space travel are still unclear. Mice were chosen as a biological model for understanding the health impacts of space travel due to their similar reproductive systems to humans. The study's authors emphasize the need for further research on the long-term effects of spaceflight on the reproductive system. Previous research, such as the NASA Twins Study, has shown that short-term spaceflight has relatively minor effects on human health. However, few studies have investigated the long-term consequences of space travel, particularly on the female reproductive system. This new study aimed to fill that gap. The research compared 20 female mice that spent 42 days on the ISS to control groups of mice that did not. Upon returning to Earth, the ISS mice could still become pregnant. However, their offspring exhibited noticeable differences, including smaller litter sizes, fewer litters overall, and lower levels of key reproductive hormones. The offspring of the ISS mice also showed reduced muscle strength and increased stress levels in behavioral experiments. The second generation of mice had even lower AMH levels, a hormone linked to egg count, suggesting an \"acceleration of aging\" potentially caused by microgravity exposure. While the study provides valuable insights, further research is required to confirm these findings and assess their implications for human space travel, particularly for missions to Mars where exposure to cosmic radiation could be more intense.",
  "summary": "The offspring of mice that spend time on the International Space Station are more vulnerable to external stressors, a new study finds. More work is needed to understand potential health impacts on human astronauts' families.",
  "key_points": [
    "ISS mice had reduced reproductive capacity, with smaller litters and lower hormone levels.",
    "Offspring of ISS mice showed reduced muscle strength and increased stress levels.",
    "Second generation had even lower AMH levels, suggesting accelerated aging."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}