JPL Visions of the Future, Mars (2018) illustrated by Jet Propulsion Laboratory (JPL) / NASA. 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Original public domain image… https://www.rawpixel.com/image/10184894/image-people-moon-spaceFree Image from public domain licenseOptics: crystals exhibiting interference colours. Colour mezzotint by R.H. Digeon, ca. 1868, after J. Silbermann. https://www.rawpixel.com/image/13959241/image-background-person-artFree Image from public domain licenseOptics: interference phenomena, exhibited by diffraction gratings. Coloured mezzotint by M. Rapine [1883], after B. Desgoffe. https://www.rawpixel.com/image/13968649/image-background-pattern-circleFree Image from public domain licenseBlack woman art sunglasses portrait. https://www.rawpixel.com/image/12713102/black-woman-art-sunglasses-portrait-generated-image-rawpixelView licenseRocket vehicle purple blue. 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