Here's why:
* Spectral Lines: When light from the sun passes through a spectroscope, it is separated into its component wavelengths, creating a spectrum. This spectrum is not a continuous rainbow but has dark lines called Fraunhofer lines.
* Element Signatures: Each element in the sun absorbs light at specific wavelengths, creating unique dark lines in the spectrum. The pattern of these lines acts like a fingerprint, allowing us to identify the elements present.
* Hydrogen and Helium Dominance: The most prominent lines in the sun's spectrum correspond to hydrogen and helium, indicating their abundance in the sun's composition.
While other elements are present in smaller amounts, hydrogen and helium make up the vast majority of the sun's mass.
