Hydrogen is established as the most abundant element in the universe, primarily determined through the analysis of absorption and emission spectra. Helium ranks as the second most abundant element, first identified in 1868 via an unexplained emission line in sunlight. The discussion emphasizes that any undiscovered elements are likely to have short lifetimes, making them improbable candidates for abundance. To accurately assess elemental abundance, scientists must sample galaxies, stars, and planets, analyzing their emission lines and estimating mass.
PREREQUISITESAstronomers, astrophysicists, geochemists, and anyone interested in the elemental composition of the universe and the methods used to determine it.
One would have to sample galaxies/stars/planets to look at emission lines, and make some estimates of mass, in order to determine the relative abundance of elements in the cosmos.mech-eng said:How can scientists determine,calculate or understand that in the universe hydrogen is the most abundunt element as there are thousands of galaxy with their own planets. There might even an undiscovered element that could be most abundunt.
Have a nice day.