GENERAL KNOWLEDGE

Detailed explanation-1: -The surface temperature of a star determines the color of light it emits. Blue stars are hotter than yellow stars, which are hotter than red stars.

Detailed explanation-2: -A star’s surface temperature can be determined from its spectrum. The Hertzsprung-Russell diagram sorts stars by luminosity and temperature. Most stars are on the main sequence of the Hertzsprung-Russell diagram.

Detailed explanation-3: -The surface temperature is determined by the luminosity and radius. The luminosity is governed by the central temperature. An increase in mass, increases the central temperature and greatly increases the luminosity. The radius also increases, but not by enough to compensate, so the surface temperature also rises.

Detailed explanation-4: -The colors of stars from hottest to coldest are blue, blue-white, yellow, orange, and red. The colors of the stars indicate their surface temperatures. There are five star colors: blue, white, yellow, orange, and red. The hottest stars are blue, with temperatures around 25, 000 K.