OSIRIS-REx is on the way. Perhaps in 7 years, NASA will return a 60 gram sample from asteroid Bennu.
Here's a link...
http://www.aero-news.net/aNNTicker.cfm?do=main.textpost&id=f890acec-b92f-4e1d-b2c3-be3a706b229f
ASTROBLEME
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