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At the very end of the TAGSAM arm is the sample collector head - it's sort of like my hand, and it'll be the only part of me that touches Bennu's surface while gathering a sample. Image details: https://bit.ly/2G5SFhm pic.twitter.com/mOJoGCAYsu
The collector head is very flexible, and is connected via a hinge-like design so that it can tilt with Bennu's surface. It's also pretty small, measuring 12 inches (30 cm) in diameter - a bit bigger than a dinner plate! 
pic.twitter.com/p1Q80tpDep
Once I touch down and the gas disturbs the surface material, some of those rocks and dust will be gathered into the collector head…pic.twitter.com/nvrbCPDjis
My team won't know whether I've successfully collected a sample until a couple of days after TAG. But once I take images of inside the sampler head, we'll know what we've got! Then I'll be able to show you the sample that Earth scientists will study for generations to come 
pic.twitter.com/cN4iKyimdq
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