Astronomy

Hydrogen river seen in space

Print edition : February 21, 2014

This composite image shows the bright star-filled central region of galaxy NGC 6946 in optical light (blue), the dense hydrogen tracing out the galaxy’s sweeping spiral arms and galactic halo (orange), and the extremely diffuse and extended field of hydrogen engulfing NGC 6946 and its companions (red). Photo: Courtesy: NRAO

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