NASA is going to great lengths to keep dirty human fingers off its $4.3 billion space telescope

GREENBELT, Md. — When visiting a $4.3 billion space telescope, cleanliness is paramount. Entering the clean room where NASA built its Nancy Grace Roman Space Telescope requires an eight-step process in three separate rooms to clean you from hair to shoes. The agency has spared no effort to keep its next-generation observatory free from earthly contamination ahead of a planned launch in August.

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