Which scientific term best matches this description: Light at wavelengths shorter than violet visible light, ranging from 100 to 400 nanometers?

A) refracted light

B) spectrum (plural: spectra)

C) wavelength

D) ultraviolet (UV)

Answer: D

Explanation: Light at wavelengths shorter than violet visible light, ranging from 100 to 400 nanometers. Earth's atmosphere blocks out most ultraviolet light from astronomical sources, so studying them requires telescopes in the upper atmosphere or in space.

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