What can be used in astronomy to estimate the surface temperature of a star?

Astronomers measure the temperatures of the surfaces of stars by making a comparison of their spectra to the spectrum of a black body, and black body is the one that absorbs all the radiation strike on it. Temperature of black body is known and hence surface temperature can be found.

This is what i found “getting into the technicalities, the continental crust has a density of around 3.0 g/cm3 compared to 2.6 g/cm3 of the continental crust. in addition, the continental crust is much thicker than the oceanic crust. the recycling process does not happen to the continental layer.” i hope this you for what your looking for. can you plz mark me brainliest?