Photos credit: Northrop Grumman

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The JPSS-4 satellite stands tall in the electromagnetic interference (EMI) chamber, a key satellite testing milestone to ensure it can operate safely in the harsh electromagnetic environment of space.

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The JPSS-4 satellite undergoes electromagnetic interference (EMI), a key satellite testing milestone to ensure it can operate safely in the harsh electromagnetic environment of space.

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View of the JPSS-4 satellite inside of the electromagnetic interference (EMI) chamber, a key satellite testing milestone to ensure it can operate safely in the harsh electromagnetic environment of space.

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JPSS-3 and JPSS-4 are shown side-by-side at the Northrop Grumman Spacecraft Facility in Gilbert, Arizona in October. The JPSS-3 zenith panel is in the foreground of the photo, while the nadir deck of JPSS-4 spacecraft bus is visible in the…

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The JPSS-3 satellite stands on its support structure, wrapped in silver and orange mylar.

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The JPSS-3 satellite bus is shown at Northrop Grumman, wrapped in orange mylar.

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The JPSS-3 satellite bus is shown at Northrop Grumman, wrapped in orange mylar.

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The JPSS-3 satellite bus is shown at Northrop Grumman, wrapped in orange mylar.

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Norhtrop Grumman and JPSS program personnel observe JPSS-3 in the thermal vacuum chamber after completing testing.

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The JPSS-3 spacecraft in the thermal vacuum chamber after completing TVAC testing.

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The JPSS-3 spacecraft in the thermal vacuum chamber after completing TVAC testing.

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The JPSS-3 spacecraft in the thermal vacuum chamber after completing TVAC testing.

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The JPSS-3 spacecraft exits the thermal vacuum chamber after completing TVAC testing.

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The nadir, or Earth-facing, deck of JPSS-4, early on in assembly. The instruments will be integrated on this panel of the spacecraft.

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The zenith panel of JPSS-4, early on in assembly. The spacecraft is attached to a rollover fixture to orient the satellite for assembly.