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The OSIRIS REx mission has been scrutinizing the asteroid Bennu looking for site where they can take a sample, but the asteroid surface proved to be more rough rocky than they originally expected. So the target sites were 1/6th of the size they originally expected to work with, which means the navigation will have to be more accurate to get the sample without risking the spacecraft.
Meanwhile elsewhere the Japanese Hayabusa 2 mission is heading home with its much smaller samples, we got to find out some more about Hayabusa’s results at last week’s American Geophysical Union meeting in San Francisco.
Here’s the press event announcing the OSIRIS REx site selection from the AGU
The AGU Session with the Hayabusa video has been made available again