Nature Astronomy, Published online: 10 January 2025; doi:10.1038/s41550-024-02441-2

Molecular clouds with low metal content, located in the Galactic outer disk and nearby metal-poor dwarf galaxies, show a notable deficiency in their turbulent support against self-gravity. This challenges the classical virial scenario, in which turbulence and self-gravitational energies are in equilibrium.

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