NASA Webb Telescope on Twitter: "Good question! That's the HOSS (the Hardpoint Offloader Support System). The HOSS was suspended from the top of Chamber A at @NASA_Johnson, and #Webb sat atop it during cryogenic testing. Here's some video of it: https://t.co/JSm8zCStFd… https://t.co/4RspwTzZbm"

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