Glossary – U

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Ultraviolet: electromagnetic radiation beyond the blue/violet end of visible light. Ultraviolet radiation is more energetic than visible light but less than x-rays. Ultraviolet wavelengths are typically measured in nanometers (nm, 10^-9m).
Unification of Active Galaxies: the theory that active galaxies are essentially all the same and that the different observed features are due to the orientation of the galactic plane with respect to the viewer.

NASA’s Neurodiversity Network materials are based upon work supported by NASA under award number 80NSSC21M0004 to Sonoma State University, working in partnership with the Education Development Center (EDC), the New York Hall of Science, and WestEd. The original version of this website was developed as part of NASA’s Universe of Learning under award number NNX16AC65A to the Space Telescope Science Institute. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration. Contact the AfH team by emailing edeon@sonoma.edu.