<ul><li>High-velocity clouds (HVCs) in the Milky Way's halo were believed to comprise a significant amount of baryonic matter.</li><li>A study using data from the Galactic All Sky Survey (GASS) estimates that HVCs actually make up an insignificant fraction of the galaxy's baryonic mass.</li><li>Previous observations suggested up to 10% of the halo baryonic mass could be due to HVCs, but the new estimation is closer to 0.1%.</li><li>Further radio surveys are needed to improve the accuracy of HVC distances and obtain a more precise value.</li></ul>

High Velocity Clouds Comprise Less of the Milky Way’s Mass Than We Thought

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