#PPOD: The graceful spiral arms of Messier 83, also known as the Southern Pinwheel Galaxy, reveal a hidden world of cold gas in this view from Chile's Atacama Large Millimeter/submillimeter Array (ALMA). Located approximately 15 million light-years from Earth, M83 is a nearby spiral galaxy whose sweeping arms contain vast reservoirs of molecular gas—the raw material from which new stars are born. Credit: ALMA (ESO/NAOJ/NRAO)/J. Koda et al.

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