Visiting the Roman Space Telescope - as It's Being Assembled

"The next great space telescope will study distant galaxies and faraway planets from an orbital outpost about a million miles from Earth," writes the Washington Post. "But first it has to be put together, piece by piece, in a cavernous chamber at the NASA Goddard Space Flight Center in Greenbelt, Maryland."
One long-time NASA worker calls it "the largest clean room in the free world," and the Post notes everyone wears white gowns and surgical masks "to keep hardware from being contaminated by hu