Space.com: NASA's first attempt to sample an asteroid in space made a mess. It's the best mess ever, scientists say.

The spacecraft will also spin in place with its sample collection arm outstretched to measure any mass difference in the TAGSAM, which will reveal how much sample, if any, was collected. Mission scientists are hoping to collect 2.1 ounces (60 grams) of asteroid Bennu for return to Earth.