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Determining the Ages of Stars Using D/H Ratios

The slope of D/H ratio given Earth’s age of 4.5 billion years, and a D/H ratio via VSMOW of 1D/6250H is 2.8125*10^13. All you have to do to determine the age of an evolved or evolving star is to take the slope and multiply that against the D/H ratio to get the age of the star. It is a linear relation and very useful.