A diffraction spike is an optical phenomenon commonly observed in photographs of bright light sources, especially stars, taken with telescopes or camera lenses that utilize a diaphragm with sharp edges. When light from these sources enters the lens system, it is diffracted—meaning it bends around the edges of the aperture (the opening through which light passes). The result of this diffraction can create streaks or spikes radiating outward from the bright light source in the image.
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