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Hertzsprung-russell Diagram , Hertzsprung-Russell Diagram
A Hertzsprung-Russell diagram, or HR diagram, is a graph of stellar temperatures (plotted on the horizontal axis) and lum… Evening Star , Skip to main content
evening star Star Anise , Star anise Star , Star
A star is a hot, roughly spherical ball of gas that shines as a result of nuclear fusion reactions in its core. Stars are one of the fundamental… Star Cluster , Star clusters are groups of stars that occur close to each other in space (and, thus, are gravitationally bound to one another), appear to have rough… Variable Star , Variable stars are stars that vary in brightness over time. In most cases, these changes occur very slowly over a period of months or even years. In…
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main-sequence star