Astronomy:Living on the Planets
In 1972, the crew members of the Apollo 17 mission blasted off and returned to earth. This marked the culmination of the Apollo program, which had at its heart the goal of landing men on another world. In the years since then, there has been a call to return humans to the moon — not just for a quick trip, but for good. But before we consider how we are going to live on other planets, let's first look at what makes life possible here on earth.
- Added：2006
- Country：Australia
- Duration：20
- Time of update：2011/3/11 15:03:55