Why are O III lines so prominent in the spectra of emission nebulae when the amount of oxygen relative to hydrogen is a million times smaller?
Will the detection of colliding neutron stars by LIGO help answer the question of where heavy elements came from?
Are there any naked-eye visible stars in our Milky Way that are particularly rich in calcium? (I'm just curious)
How to determine atomic number density of an element in a star based on equivalent width measurements
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