NASA planning to explore Venus in manned solarpowered airship

摘要

<正>NASA’s focus for human spaceflight seems to change every few years as we learn something new about what it will take to keep human beings alive out there.However,NASA usually picks one of a few targets.Will we go to Mars next,maybe back to the Moon,or perhaps an asteroid is a better option?NASA’s Langley Research Center has put forward an interesting proposal—instead of the traditional choices,