title: Andromeda X
text: Andromeda X (And 10) is a dwarf spheroidal galaxy about 2.9 million light-years away from the Sun in the constellation Andromeda.  Discovered in 2005 by Zucker et al., And X is a satellite galaxy of the Andromeda Galaxy (M31). Aided by the application of stellar photometry to data from the Sloan Digital Sky Survey similar to the Andromeda IX discovery, the new finding indicates that this type of extremely faint satellite might be common in the Local Group, potentially providing further support for hierarchical cold dark matter models.
  
  See also
  
   List of Andromeda's satellite galaxies
  
  References
  
  External links
   SEDS webpage for Andromeda X
   Andromeda X: Andromeda's Newest Satellite Galaxy
  
  Dwarf spheroidal galaxies
  5056921
  Local Group
  Andromeda Subgroup
  Andromeda (constellation)