简介：The attempt to send and land astronauts on Mars risks billions of dollars and the lives of those brave enough to attempt it. Is the possible benefit really worth the risk? And is it really achievable? Guiding us through this ethical and scientific mi
简介：NASA's Jet Propulsion Laboratory to follow the birth of the Perseverance rover, whose prim【ZiYuanTun.Com】ary mission is to search for traces of life in an ancient river delta on Mars and collect samples for eventual return to Earth. 译文(3): 美国国家航