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Lodi | Wine Country, Zinfandel, Agriculture | Britannica Lodi, city, San Joaquin county, central California, U S Lodi lies along the Mokelumne River at the junction of the San Joaquin and Sacramento valleys just northeast of Stockton, on the edge of the Sacramento River delta It originated as Mokelumne Station (1869) on the Central Pacific (later part of the Southern Pacific) Railroad In 1873 it was renamed, presumably for a famous racehorse of
Stellar classification | Types, Spectral Classes Luminosity | Britannica Stellar classification, scheme for assigning stars to types according to their temperatures as estimated from their spectra The generally accepted system of stellar classification is a combination of two classification schemes: the Harvard system, which is based on the star’s surface temperature,
Sun | Definition, Composition, Properties, Temperature, Facts . . . The Sun is classified as a G2 V star, with G2 standing for the second hottest stars of the yellow G class—of surface temperature about 5,800 kelvins (K)—and the V representing a main sequence, or dwarf, star, the typical star for this temperature class
Britannica Kids Britannica’s new platform provides content designed and written specifically for early learners Creating a more engaging and fun learning experience for students, the activities in Britannica Fundamentals align with the content areas children learn in the classroom
Definition, Formation, Types, Properties, Facts - Britannica Galaxies are extremely varied not only in structure but also in the amount of activity observed Some are the sites of vigorous star formation, with its attendant glowing gas and clouds of dust and molecular complexes Others, by contrast, are quiescent, having long ago ceased to form new stars
Star | Definition, Light, Names, Facts | Britannica Star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources This article describes the properties and evolution of individual stars Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars
Black Death | Plague, Death Toll, Definition, Cause, Symptoms, Effects . . . The effects of the Black Death were many and varied Trade suffered for a time, and wars were temporarily abandoned Many laborers died, which devastated families through lost means of survival and caused personal suffering; landowners who used laborers as tenant farmers were also affected The labor shortage caused landowners to substitute wages or money rents in place of labor services in an
Star - Mass, Luminosity, Age | Britannica - Encyclopedia Britannica Star - Mass, Luminosity, Age: Temperatures of stars can be defined in a number of ways From the character of the spectrum and the various degrees of ionization and excitation found from its analysis, an ionization or excitation temperature can be determined
Betelgeuse | Size, Dimming, Color, Meaning, Facts | Britannica Betelgeuse, second brightest star in the constellation Orion, marking the eastern shoulder of the hunter It has a variable apparent magnitude of about 0 6 and is one of the most luminous stars in the night sky Betelgeuse is a red supergiant star roughly 764 times as large as the Sun
Hertzsprung-Russell diagram | Definition Facts | Britannica Stars of a few solar masses eject their outer layers as planetary nebulae, which have a hot, luminous central star found in the upper left of the diagram Stars like the Sun burn down to cool white dwarfs, which are found in the bottom left of the diagram