What are nebulae fundamentally composed of primarily?
Answer
Vast interstellar clouds of gas, mainly hydrogen and helium, mixed with cosmic dust.
At their most basic level, nebulae are enormous clouds existing within the interstellar medium. Their primary constituents are gas, where hydrogen and helium constitute the vast majority of the elemental content, along with intermixed particles referred to as cosmic dust. Although these clouds can be extremely tenuous compared to terrestrial air, their immense, light-year spanning scales ensure they contain substantial total mass, providing the raw material for future stellar generations.
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