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M51星系图片来源：X-ray: NASA/CXC/Wesleyan Univ./R. Kilgard; UV: NASA/JPL-Caltech; Optical: NASA/ESA/S. Beckwith & The Hubble Heritage Team (STScI/AURA); IR: NASA/JPL-Caltech/Univ. of Az/R. Kennicutt

玫瑰星系图片来源： NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

UGC 6093星系图片来源：ESA/Hubble & NASA

NGC 3351星系图片来源：Science: NASA, ESA, ESO-Chile, ALMA, NAOJ, NRAO; image processing: Joseph DePasquale (STScI)

NGC 474星系图片来源：NASA, ESA, and D. Carter (Liverpool John Moores University); Image processing: G. Kober (NASA Goddard/Catholic University of America)