"The identification of chemical atoms in stellar atmospheres is, in fact, is accomplished thousands of times a year in numerous observations. It is interesting to recall that such an achievement was considered for ever outside the boundary of human activates. A hundred years ago, Auguste Comte, … a great French philosopher, said that “we shall never be able to study the chemical composition of The celestial bodies”. His was an encyclopedic mind but it did not encompass the potentialities of the spectroscope."