With the addition of Saturn, the James Webb Space Telescope has finally captured all four of our Solar System's giant worlds.
JWST's observations of the ringed planet, taken on 25 June 2023, have been cleaned up and processed, giving us a spectacular view of Saturn's glorious rings, shining golden in the darkness.
By contrast, the disk of Saturn is quite dark in the new image, lacking its characteristic bands of cloud, appearing a relatively featureless dim brown. This is because of the wavelengths in which JWST sees the Universe – near- and mid-infrared. These wavelengths of light areFor example, thermal emission – associated with heat – is dominated by infrared wavelengths. When you're trying to learn about what's going on inside a planet wrapped in thick, opaque clouds, studying its temperature is a valuable way to go about it.
Some elements and chemical processes emit infrared light, too. So seeing the planets of the Solar System in wavelengths outside the narrow range admitted by our vision can tell us a lot more about what they have going on. Saturn in near-infrared wavelengths, using a filter that blocks emission from methane in Saturn's atmosphere. (
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