False-color mosaic image of the Milky Way Galaxy, highlighting high-velocity clouds (HVCs) as bright orange and red regions. One particularly large HVC, showing low metallicity, is circled. The image reveals the complex interplay of gas flows and the potential origins of these fast-moving clouds, either from supernova explosions or merging dwarf galaxies. The Milky Way galaxy is shown as a lighter band across the center.

Astronomy Picture from 14/12/1999

High Velocity Clouds and the Milky Way

Source: https://apod.nasa.gov/apod/ap991214.html


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