luminosity
121History of supernova observation — The known history of supernova observation goes back to 185 CE, when supernova SN 185 appeared, the oldest appearance of a supernova recorded by humankind. Several additional supernovae within the Milky Way galaxy have been recorded since that… …
122Type II supernova — The expanding remnant of SN 1987A, a Type II P supernova in the Large Magellanic Cloud. NASA image. A Type II supernova (plural: supernovae) results from the rapid collapse and violent explosion of a massive star. A star must have at least 9… …
123NGC 1553 — core by HST. 0.3′ view Observation data (J2000 epoch) Constellation Dorado …
124K-type main-sequence star — Hertzsprung–Russell Diagram Spectral Type Br …
125Baade , Wilhelm Heinrich Walter — (1893–1960) German–American astronomer Baade, born the son of a schoolteacher in Schröttinghausen, Germany, was educated at the universities of Münster and Göttingen, where he obtained his PhD in 1919. He worked at the University of Hamburg s… …
126main sequence — main se quence, n. (Astronomy) That region on a two dimensional graph of luminosity versus temperature for stars (the Herzsprung Russel diagram), which runs from high temperature and high luminosity to low temperature and low luminosity, in which …
127Apparent magnitude — Asteroid 65 Cybele and 2 stars with their magnitudes labeled The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.… …
128Arthur Stanley Eddington — Infobox Scientist name = Arthur Eddington image width = 247px caption = Arthur Stanley Eddington birth date = birth date|1882|12|28|df=y death date = death date and age|1944|11|22|1882|12|28|df=y birth place = Kendal, England death place =… …
