Hr diagram

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The Hertzprung-Russell diagram is a graph relating stars' temperature to their luminosity. The graph has 5 main regions, each for a different group of stars. The Main Sequence contains your average, run-of-the mill stars for which luminosity is related directly to temperature. Main Sequence stars tend to be in the beginning or middle of their lives, when the pressure outwards from the heat of nuclear fusion in their cores still balances out the inward force of gravity. Red Giants and…

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