image: Engineers work on the newly integrated Landsat 9 satellite in a cleanroom at the Northrop Grumman facility in Gilbert, Ariz. In December, the team attached Landsat 9's two instruments: OLI-2 (left) and TIRS-2 (right) to the spacecraft bus at the bottom of the image. The two instruments are covered to protect them from contaminants.
https://www.nasa.gov/feature/goddard/2020/landsat-9-the-pieces-come-together
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Credit: Northrop Grumman