Europe picks categories for three flagship space missions

In 2013, scientists from Japan sent samples of freeze-dried mouse sperm to live on the ISS -- and now they finally know how it affected them. Even after six-years of exposure to space radiation, the researchers say the space sperm still produced healthy pups.

Frozen mouse sperm that spent 6 years in orbit used to conceive 8 healthy ‘space pups’

Mouse sperm thrived despite six years of exposure to space radiation