In a very interesting article, “The Composition of Our Universe” (Physics Today, April, 1950), Dr. Harrison Brown brings forth convincing evidence which suggests strongly that our cosmos is remarkably uniform in its chemical composition. In fact, apart from a few notable exceptions which can be easily accounted for by local conditions, the relative abundance of various chemical elements is nearly the same on the earth, on the planets, on the sun and other stars of the Milky Way system, in the diffuse interstellar material, and in the distant spiral galaxies which represent the independent stellar systems of their own.

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