Leo A

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Leo A
Leo A Hubble WikiSky.jpg
Observation data
Other designations
Leo III, UGC 5364, DDO 69, PGC 28868[1]
See also: Galaxy, List of galaxies

Leo A, also known as Leo III, is an irregular galaxy that's a member of the Local Group. It lies 2,6 million light-years from Earth and was discovered by Fritz Zwicky in 1942. The estimated mass of this galaxy is 8 * 107 solar masses, but around 80% of the galaxy consists of dark matter. Leo A is unique among irregular galaxies in that more than 90% of its stars formed are younger than 8 billion years ago, suggesting a rather unusual evolutionary theory.[2] The presence of RR Lyrae variable stars shows that the galaxy has an older stellar population that is < 10 billion years of age.[3]


  1. Cite error: Invalid <ref> tag; no text was provided for refs named ned
  2. Cole, Andrew (March 2007). "Leo A: A Late-blooming Survivor of the Epoch of Reionization in the Local Group". The Astrophysical Journal Letters 659 (1): L17-20. arXiv:astro-ph/0702646. Bibcode 2007ApJ...659L..17C. doi:10.1086/516711.
  3. Vansevičius, Vladas (August 2008). "The Full-fledged Dwarf Irregular Galaxy Leo A". The Astrophysical Journal 611 (2): L93–L96. arXiv:astro-ph/0405313. Bibcode 2004ApJ...611L..93V. doi:10.1086/423802.

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