The spectra of interstellar gas clouds show that they have the same basic composition as:

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The spectra of interstellar gas clouds show that they have the same basic composition as stars, which includes elements such as hydrogen, helium, carbon, nitrogen, and oxygen among others. This is because the gas clouds are the raw materials from which stars form. Interstellar dust may also be present in the gas clouds, but it is not the same composition. Earth's atmosphere, asteroids, and the Martian polar caps would have different compositions since they have distinct origins and histories. The spectra of interstellar gas clouds show the same basic elemental composition as stars, indicating that the interstellar gas clouds are the raw material from which stars are formed. This composition includes elements like hydrogen, helium, carbon, oxygen, and nitrogen, which are also present in our own Sun and other stars. Interstellar dust and asteroids have a different composition, while Earth's atmosphere and the Martian polar caps are not relevant to the question.

The Spectra of Interstellar Gas Clouds Show That They Have