Spaceflight may harm reproductive system of astronauts' kids and grandkids, mouse study finds

A study of female mice that spent 42 days on the ISS found their offspring and grandoffspring produced smaller, fewer litters and had lower levels of key reproductive hormones. The second generation also showed about 15% less muscle strength. Whether the effects apply to humans remains unclear.

• 20 female mice spent 42 days aboard the ISS
• Second-generation offspring had about 15% less muscle strength
• Second and third generations showed lower AMH hormone levels
• The study was published June 30 in the journal PNAS