The inset image shows X-ray arcs that astronomers say are signs of galactic burping in the Messier 51 galaxy system, captured by NASA's Chandra X-ray Observatory. X ray: NASA/CXC/Univ of Texas/E.Schlegel et al; Optical: NASA/STScI hide caption

toggle caption X ray: NASA/CXC/Univ of Texas/E.Schlegel et al; Optical: NASA/STScI

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