Contact: Susan Hendrix
NASA/Goddard Space Flight Center
Caption: Magnetospheric Multiscale mission integration and test team members, seen here in white clean-room suits, integrate the fourth and final instrument deck onto the spacecraft deck/thrust tube assembly, which houses the propulsion module, officially making it an observatory. This clean room was designed and built for MMS to house all four spacecraft at once: Two additional observatories appear in the background.
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Related news release: NASA's MMS team assembles final observatory