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Image description: This round, gold coated secondary mirror that looks like a sun will fly aboard NASA’s James Webb Space Telescope. The thickness of the gold coating on the mirrors is only 100 nanometers thick. A human hair is roughly 1,000 times thicker.
Photo by Chris Gunn, NASA.

Image description: This round, gold coated secondary mirror that looks like a sun will fly aboard NASA’s James Webb Space Telescope. The thickness of the gold coating on the mirrors is only 100 nanometers thick. A human hair is roughly 1,000 times thicker.

Photo by Chris Gunn, NASA.