Aliens?

Aliens?

No, it’s not a flying saucer, it is the domed top to a 70 foot long vacuum tank at the Lewis Research Center’s Electric Propulsion Laboratory, Cleveland, Ohio.

The three technicians shown here in protective clothing had just emerged from within the tank where they had been cleaning in the toxic mercury atmosphere, left after ion engine testing in the tank.

Image/text credit: NASA

also on iainclaridge.net

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