Galassia ad anello polare: differenze tra le versioni

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m →‎Collegamenti esterni: Bot: fix citazione web (v. discussione)
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==Collegamenti esterni==
* [{{cita web|http://antwrp.gsfc.nasa.gov/apod/ap990510.html |APOD: May 10, 1999 - Polar Ring Galaxy NGC 4650A]}}
* [{{cita web|http://hubblesite.org/newscenter/archive/releases/1999/16/ |Internet Voters Get Two Galaxies in One from Hubble]}}
* [http://space.newscientist.com/article/mg19726455.500-x-marks-the-spot-in-dark-matter-web.html?feedId=online-news_rss20 X marks the spot in dark matter web] - Polar ring galaxies offer first-hand evidence of the existence of the cosmic web, ''New Scientist'', 29 February 2008