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↑ "Free-Floating Planets May be More Common Than Stars". Pasadena, CA: NASA's Jet Propulsion Laboratory. 2011-02-18. The team estimates there are about twice as many of them as stars.
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↑ Young, Kelly (2006-06-06). "Andromeda galaxy hosts a trillion stars". NewScientist. अभिगमन तिथि 2006-06-08.
↑ Majaess, D. (2010). "Concerning the Distance to the Center of the Milky Way and Its Structure". Acta Astronomica. 60: 55. बिबकोड:2010AcA....60...55M.
↑ Majaess; Turner; Lane (2009). "Searching Beyond the Obscuring Dust Between the Cygnus-Aquila Rifts for Cepheid Tracers of the Galaxy's Spiral Arms". arXiv:0909.0897 [astro-ph.GA].
↑ Lepine; Roman-Lopes; Zulema Abraham; Junqueira; Mishurov (2010). "The spiral structure of the Galaxy revealed by CS sources and evidence for the 4:1 resonance". arXiv:1010.1790 [astro-ph.GA].
↑ Benjamin, R. A. (2008). "The Spiral Structure of the Galaxy: Something Old, Something New...". In Beuther, H.; Linz, H.; Henning, T. (ed.). Massive Star Formation: Observations Confront Theory. 387. Astronomical Society of the Pacific Conference Series. pp. 375. http://www.space.com/scienceastronomy/080603-aas-spiral-arms.html.
↑ Bryner, Jeanna (2008-06-03). "New Images: Milky Way Loses Two Arms". Space.com. अभिगमन तिथि 2008-06-04.
↑ McKee, Maggie (August 16, 2005). "Bar at Milky Way's heart revealed". New Scientist.