How the JWST’s cosmic images are made
As light travels through space, it gets stretched by the expansion of the universe. This is why many of the most distant objects shine in infrared light, which is longer in wavelength than visible light. We can't see this ancient light with our eyes, but the James Webb Space Telescope was designed to capture it, revealing some of the first galaxies ever to form.
Micro Shutter Array: A grid of 248,000 small doors can open or close to measure spectra—light spread into its constituent wavelengths—from up to 100 points in a single frame. Integral Field Unit: A combined camera and spectrograph captures an image, along with spectra for each pixel, revealing how the light varies across the field of view.
Near-Infrared Spectrograph : This dedicated spectrograph can capture 100 spectra simultaneously with its micro shutter array. It’s the first space instrument capable of taking spectroscopy for so many objects at once.
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