How does the density of material within the densest parts of a nebula compare to the best vacuum achievable in human laboratories?
Answer
Far lower than the best vacuum achievable in human laboratories
Despite holding enough mass to form stars, the material within nebulae is incredibly diffuse; even in their densest regions, the pressure and density are far lower than the best vacuums created on Earth.
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Nebulae: Crash Course Astronomy #36 - YouTube
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