ahlam1399
09-08-2016, 04:30 PM
The mission aims to circle a hill-sized asteroid for two years, then skim its surface and bring a hearty sample of 4.5 billion-year-old dirt back to Earth.
أكثر... (http://www.npr.org/sections/thetwo-way/2016/09/08/491482001/nasa-mission-to-retrieve-ancient-asteroid-dust-is-ready-for-launch?utm_medium=RSS&utm_campaign=news)
أكثر... (http://www.npr.org/sections/thetwo-way/2016/09/08/491482001/nasa-mission-to-retrieve-ancient-asteroid-dust-is-ready-for-launch?utm_medium=RSS&utm_campaign=news)