Nearly a half-century after humans voyaged to the moon, NASA and private U.S. companies are once again setting their sights beyond low Earth orbit
http://www.space.com/36294-scientists-debate-next-space-destination-for-astronauts.html
Nearly a half-century after humans voyaged to the moon, NASA and private U.S. companies are once again setting their sights beyond low Earth orbit
http://www.space.com/36294-scientists-debate-next-space-destination-for-astronauts.html