Radio image of W4, a superbubble in the Milky Way galaxy, showing a chimney-like structure of hot gas venting from the galactic plane. The dark area extending upwards is the chimney, spanning 250 light-years, fueled possibly by supernovae or stellar winds from the young star cluster OCl 352 at its base. The image was produced by the Canadian Galactic Plane Survey (CGPS).

Astronomy Picture from 07/02/2000

The W4 Chimney

Source: https://apod.nasa.gov/apod/ap000207.html


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