As NASA retreats from an ambitious human spaceflight program for the foreseeable future, other countries are moving ahead with multibillion-dollar plans to go to the moon, build space stations and even take the long voyage to Mars.
As NASA retreats from an ambitious human spaceflight program for the foreseeable future, other countries are moving ahead with multibillion-dollar plans to go to the moon, build space stations and even take the long voyage to Mars.