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why is the small, faint, very distant galaxy shown here (arrow) bright at infrared but not detectable at visible-light wavelengths? an infrared image shows a very bright object in the center of a field of dimmer round and oblong objects. an inset shows that next to the very bright object is a particularly small, dim object. the visible light emitted by this galaxy is redshifted into the infrared. long ago galaxies were much cooler than they are now. because it contains only very hot stars. infrared detectors are more efficient at counting photons than visible light detectors. because intergalactic dust absorbs all the visible light.

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This galaxy's visible light has its infrared emissions redshifted. Is the little, dim, far-off galaxy depicted here (arrow) brilliant in the infrared yet invisible to the human eye?

Exactly what hue has the longest wavelength?

Red light, which has the longest wavelength in the spectrum, is on one end. The shortest wavelength of light is blue or violet. Each colour in the colour spectrum is present in white light. It is a rainbow's worth of hues.

Which 6 lights are present?

The resulting sunlight is divided into the range of colours that are visible. Airborne water vapour serves also as refractive medium in this scenario, which results in a rainbow. The acronym "Roy G Biv" can be used to remember the sequence of wavelengths for red, orange, yellow, green, blue, cyan (the blue/violet border), and violet.

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