Temperature (T) in Kelvin = K Temperature (T) compared to the Sun = T/5800 = (solar temp) Luminosity (L) from HR graph = (solar luminosity) Mass (M) from Mass-luminosity graph = (solar mass) Radius (R) =[L]v2 / T2 = |12 /| ]2 (1/2 power is the same as square root) = | /] | = (solar radius) Lifetime (t) = Mass / Luminosity = / = (solar lifetime) Lifetime (t) in years =t x (10 years) = X (100 years) = years