False-color image of an all-sky HI (neutral hydrogen) survey. The bright band across the center represents the plane of our Milky Way galaxy, showing vast clouds of hydrogen gas tens to hundreds of light-years across. These structures are shaped by stellar activity within the galactic disk. The image is based on radio wave emissions from hydrogen atoms at a wavelength of 21 centimeters.

Astronomy Picture from 13/01/2001

A Sky Full Of Hydrogen

Source: https://apod.nasa.gov/apod/ap010113.html


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