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Meteors, Asteroids and Comets
UVOT grism images


The UVOT grism produces images that separate incoming light from ultraviolet and visible sources by wavelength. Molecules produce separate images at discrete wavelengths: hydroxyl (OH) at 308 nm, just beyond the visual range; CN and C3 produce purple light at 387 and 406 nm, respectively. C2 emission at 500 nm is responsible for the dominant green color that characterizes many comets. Comet dust, which reflects sunlight, instead produces a broad, continuous swath. Credit: NASA/Swift/D. Bodewits (UMD) and S. Immler (GSFC)

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