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Edgewater Technology shooting. / 42.50028°N 71.07583°W / 42.50028; -71.07583. On December 26, 2000, a mass shooting took place at Edgewater Technology in Wakefield, Massachusetts, United States. Michael Morgan McDermott, an application support employee, shot and killed seven of his coworkers. It is the deadliest mass shooting in ...
Yerkes luminosity class IV. The term subgiant was first used in 1930 for class G and early K stars with absolute magnitudes between +2.5 and +4. These were noted as being part of a continuum of stars between obvious main-sequence stars such as the Sun and obvious giant stars such as Aldebaran, although less numerous than either the main sequence or the giant stars.
The Henyey track is a path taken by pre-main-sequence stars with masses greater than 0.5 solar masses in the Hertzsprung–Russell diagram after the end of the Hayashi track. The astronomer Louis G. Henyey and his colleagues in the 1950s showed that the pre-main-sequence star can remain in radiative equilibrium throughout some period of its ...
Probability mass function. In probability and statistics, a probability mass function (sometimes called probability function or frequency function [1]) is a function that gives the probability that a discrete random variable is exactly equal to some value. [2] Sometimes it is also known as the discrete probability density function.
The molar mass is defined as the mass of a given substance divided by the amount of a substance, is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule. The molar mass is usually the more appropriate quantity when dealing ...
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 ...
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M☉. In SI base units. (1.988 47 ± 0.000 07) × 1030 kg [1] [failed verification] The solar mass ( M☉) is a standard unit of mass in astronomy, equal to approximately 2 × 1030 kg. It is approximately equal to the mass of the Sun. It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and ...