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1. en.wikipedia.org › wiki › BetelgeuseBetelgeuse - Wikipedia

   en.wikipedia.org › wiki › Betelgeuse

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   1 giorno fa · Betelgeuse, α Ori, 58 Ori, HR 2061, BD +7°1055, HD 39801, FK5 224, HIP 27989, SAO 113271, GC 7451, CCDM J05552+0724, AAVSO 0549+07. Database references. SIMBAD. data. Betelgeuse is a red supergiant star in the constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second-brightest in its ...

   • B−V color index: +1.85
   • Mass: 16.5-19 M☉

   • Constellation: Orion

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3. en.wikipedia.org › wiki › UltravioletUltraviolet - Wikipedia

   en.wikipedia.org › wiki › Ultraviolet

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   8 ore fa · Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 100–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...