The science of stellar spectroscopy was pioneered by Joseph von Fraunhofer and Angelo Secchi. By comparing the spectra of stars including Sirius to the Solar, they observed discrepancies within the strength and quantity of their absorption traces—the dim lines in stellar spectra because of the atmosphere's absorption of precise frequencies. https://jaiden45oi4.yomoblog.com/44617043/the-2-minute-rule-for-star