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NASA's SPHEREx mission will use these filters to conduct spectroscopy, a technique that lets scientists measure individual wavelengths of light from a source, which can reveal information such as the chemical composition of the object or how far away it is. Each about the size of a cracker, the filters appear iridescent to the naked eye. The filters have multiple segments that block all but one specific wavelength of infrared light. Every object SPHEREx images will be observed by each segment, enabling scientists to see the specific infrared wavelengths emitted by every star or galaxy the tel…
