You knew it would be mice. They get tagged for doing everything first, usually even before the guinea pigs. And so it is with the first birth of mammals in space. The Translife Mars Gravity Biosatellite is being planned to explore how Mars’ reduced gravity will affect humans, from birth to death. Since the satellite will be too small to actually carry humans into space, mice will take the first shot at procreation ever (known to be) attempted by a mammal outside Earth and its atmosphere. The mission is a project of the private Mars Society, which first discussed it last fall and, earlier this month, announced a team of students from various universities to help build the spacecraft and conduct the experiments. Researchers hope the orbiting mice, aloft for two months, will survive and return to Earth as a new clan.