Where will NASA send its astronauts next?

 作者:莫漠     |      日期:2019-03-08 02:17:29
By David Shiga Read more: Click here for a longer version of this story NASA has a problem. It doesn’t have the money to complete its current human space-flight plan, which is meant to return people to the moon by 2020. And the Ares I rocket it is building to replace the space shuttle is not likely to be ready until 2017,