Question

We know the sun is primarily made from hydrogen and helium on the basis of its:

Answer 1

We know the sun is primarily made from hydrogen and helium on the basis of its spectrum.

What is Sun's spectrum?

Sun's spectrum refers to the light of the Sun whose wavelength spectra can be used to identify atomic composition.

Thus spectrum (Sun's spectrum) initiates with the red light (700 nm) and ends with the blue (380 nm).

In conclusion, we know the sun is primarily made from hydrogen and helium on the basis of its spectrum.

Learn more about the Sun's spectrum here:

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