Add Yahoo as a preferred source to see more of our stories on Google. Scientists reveal potential hurdles for extraterrestrial human reproduction. Here, sunlight illuminates the lower right of planet ...

As commercial spaceflight draws ever closer and time spent in space continues to extend, the question of reproductive health beyond the bounds of planet Earth is no longer theoretical but now ...

As a quartet of astronauts make their way to the far side of the Moon, far-fetched notions of human colonies on the satellite or even Mars - a three-year return trip - are again getting an airing.