Hertzsprungrussell Diagram

When stars are plotted on an H-R diagram according to their brightness and spectral type, patterns become obvious. The vast majority of stars lie along a diagonal from faint red to brilliant blue—the "main sequence." A smaller number of red stars (the red giants) are much brighter, while some stars (the white dwarfs) are faint but still white.

position of Earth in Juy- parallax shift r 186 million miles (300 of nearby \

million km) separates opposite star a position of Earth in Juy- parallax shift r 186 million miles (300 of nearby \

million km) separates opposite star a

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