Star type M, the red stars, are the coolest stars with an average surface temperature of under 3,500 K. This type of star has a 0.3 solar mass (M☉) and an average radius of 0.4 solar radius (R☉). Examples of red stars ar... More »

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The coolest stars are red in color. A star's color gives visible information about its surface temperature. The hottest stars are blue, while white and yellow stars indicate mid-range temperatures. More »

Stars are categorized into seven stellar classes based on their surface temperature, as explained by the HyperPhysics Department at Georgia State University. Each spectral class has its own letter and set of characterist... More »

The coolest stars are red in color. A star's color gives visible information about its surface temperature. The hottest stars are blue, while white and yellow stars indicate mid-range temperatures. More »

Star luminosity depends upon both radius and temperature because luminosity is a measure of energy output. A larger star puts out more energy than a similar, but smaller star, just as a hotter star puts out more energy t... More »

"OBAFGKM" is a quick listing of the classification of stars using the Morgan-Keenan method of classification, which bases star class on temperature and spectra. A common mnemonic used to remember the classes is "Oh Be A ... More »

Though the parallax method for working out distances has been known since Euclid, even the closest stars are so distant that their shift could not be measured with the necessary precision until the 19th century. The larg... More »