thumb|Early illustration showing how many of the stars in Ursa Major move in a group

The Ursa Major Moving Group, also known as Collinder 285 and the Ursa Major association, is the closest stellar moving group – a set of stars with common velocities in space and thought to have a common origin in space and time. In the case of the Ursa Major group, all the stars formed about 400 million years ago.

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  • [https://web.archive.org/web/19991007030946/http://seds.lpl.arizona.edu/messier/xtra/ngc/uma-cl.html] University of Arizona website
  • [http://www.kencroswell.com/DescendantsOfTheDipper.html] Ken Croswell's astronomy website.
  • LeDrew, Glenn (1998). "AstroNotes: The Ursa Major Moving Cluster". Retrieved 28 July 2005.
  • Stellar kinematic groups, Superclusters, Moving Groups – D. Montes, UCM
  • [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2003AJ....125.1980K&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;high=41b4ade78800742] J.R.King et al. 2003 Astronomical Journal paper classifying group members based on Hipparcos data.