Ultraviolet astronomy is the research area focused on observing and interpreting electromagnetic radiation in the ultraviolet (UV) spectral range, typically ~10–400 nm, to investigate astrophysical plasmas and high-energy processes. Because Earth’s atmosphere absorbs most UV photons, the field relies on space-based observatories and suborbital platforms equipped with specialized optics, coatings, and photon-counting detectors. Ultraviolet observations probe hot stars, the interstellar and intergalactic medium, accretion disks, stellar winds, and shock fronts via resonance lines and continua, enabling measurements of temperature, composition, ionization state, kinematics, and mass loss. This domain is crucial for constraining models of star formation, galaxy evolution, feedback, and the baryon cycle in cosmic structures.
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