Lot - Description: What phenomenon is responsible for lack of visibility of galaxies in ultraviolet imaging, at the cut-off known as the Lyman limit or break? What is lost, as part of this phenomenon?

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In explanation: The phenomenon is redshifting, where the light from the galaxy loses energy from the distance traveled and the stretching out of the wavelength due to the expansion of the universe over time. This means those wavelengths get absorbed at a certain point (the Lyman limit) by intervening distance and other gases, so we'd see those far-off galaxies in optical light but not ultraviolet. Looking at how the wavelength of the light has changed can give us an idea of the distance of the object.