The problem they’re trying to solve is pretty easy to understand. Imaging you’re trying to see a flashlight a few km away in the darkness. No problem. But hold the flashlight beside a bright car headlight and you’re not going to be able to pick out the light from the flashlight from the glare of the headlight.
62,000 of these microshutters sit in front of the James Webb’s detector array. Astronomers can then instruct the telescope to close up any number of these shutters so that the light from bright objects is blocked, while dimmer objects are let in. The shutters will let astronomers view up to 100 different astronomical targets simultaneously, saving a lot of time.
Original Source: NASA News Release
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