APoD, Astronomy Picture of the Day, NASA and Michigan Technological University (MTU), 2005
APoD, Astronomy Picture of the Day, NASA and Michigan Technological University (MTU), 2007
Hora, Joseph L.; Latter, The near-infrared structure and spectra of the bipolar nebulae M2-9 and AFGL 2688: The role of ultraviolet pumping and shocks in molecular hydrogen excitation, Astrophysical Journal, Part 1 (ISSN 0004-637X) 437 (1), 1994, 437 (1): 281–295
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外部連結编辑
NASA APoD 1997-12-23 (页面存档备份,存于互联网档案馆) & APoD 1999-03-21 (页面存档备份,存于互联网档案馆) & APoD 2004-02-01 (页面存档备份,存于互联网档案馆) & APoD 2005-06-12 (页面存档备份,存于互联网档案馆) & APoD 2007-06-18 (页面存档备份,存于互联网档案馆) M2-9: Wings of a Butterfly Nebula