|
|references = <ref name="ned">
{{cite web
|title=NASA/IPAC Extragalactic Database
|work=Results for Messier 101
|url=http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=Messier+101&img_stamp=yes&extend=no
|accessdate=2006-12-06
}}</ref><ref name="shappee">
{{cite journal
|last=Shappee
|first=Benjamin
|coauthors=Stanek, Kris
|title=A New Cepheid Distance to the Giant Spiral M101 Based on Image Subtraction of Hubble Space Telescope/Advanced Camera for Surveys Observations
|journal=Astrophysical Journal
|date=June 2011
|year=2011
|volume=733
|issue=2
|pages=124
|doi=10.1088/0004-637X/733/2/124
|bibcode = 2011ApJ...733..124S |arxiv = 1012.3747 }}</ref><ref name="sinnott1988">
{{cite book
|editor=R. W. Sinnott
|title=The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer
|year=1988
|publisher=Sky Publishing Corporation / Cambridge University Press
|isbn=0-933346-51-4
}}</ref><ref name=ned-dist>
{{cite web
|title=Distance Results for Messier 101
|work=NASA/IPAC Extragalactic Database
|url=http://nedwww.ipac.caltech.edu/cgi-bin/nDistance?name=MESSIER+101
|accessdate=2010-05-01
}}</ref><ref name="SIMBAD-M101">
{{cite web
|title=SIMBAD-M101
|publisher=SIMBAD Astronomical Database
|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=M101
|accessdate=2009-11-29
}}</ref><ref name=GAXEL>
{{cite journal
|last=Armando |first=Gil de Paz
|coauthors=Boissier; Madore; Seibert; Boselli; et al.
|title=The GALEX Ultraviolet Atlas of Nearby Galaxies
|journal=[[Astrophysical Journal Supplement]]
|volume=173
|issue=2 |pages=185–255 |year=2007
|arxiv=0606440
|doi=10.1086/516636
|bibcode=2007ApJS..173..185G
}}</ref>
== Galaksi Pendamping ==
M101 memiliki lima galaksi pendamping yang menonjol: [[NGC 5204]], [[NGC 5474]], [[NGC 5477]], [[NGC 5585]], dan [[Holmberg IV]].<ref name="carnegieatlas" >{{cite book |author=A. Sandage, J. Bedke|year=1994|title=Carnegie Atlas of Galaxies|publisher=[[Carnegie Institution of Washington]]|isbn=0-87279-667-1}}</ref> Sebagaimana dinyatakan di atas, interaksi gravitasi antara M101 dan satelitnya mungkin telah memicu pembentukan pola grand design di M101. M101 juga mungkin terdistorsi oleh galaksi pendampingnya NGC 5474.<ref name="carnegieatlas"/> M101 dan galaksi pendamping yang terdiri dari sebagian besar atau mungkin semua [[Grup M101]].<ref name="nbg">{{cite book
|author=R. B. Tully
|year=1988
|title=Nearby Galaxies Catalog
|publisher=[[Cambridge University Press]]
|isbn=0-521-35299-1
}}</ref><ref name="fouqueetal1992">
{{cite journal
| 