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The Local Group is a group of galaxies. It includes the Milky Way, Andromeda Galaxy, and Triangulum, along with their satellites and several small galaxies. It in turn is part of the Virgo Supercluster.
Local Group

The Local Group (from Wikimedia Commons)

StructureEdit

Approximately 10,000,000 light-years in diameter, the Local Group has a rough 'dumbbell shape'. Its centre is located somewhere between the Milky Way and Andromeda, at its centre of mass.

It has a total mass of somewhere around 1.3 trillion solar masses.

GalaxiesEdit

Satellite galaxies have indented bulletpoints. Only those over one kiloparsec in diameter appear.

Possible MembersEdit

Possible members of the Local Group.

  • NGC 3109 - irregular/spiral galaxy, 2.3 billion solar masses, no apparent galactic nucleus
  • HVC 127-41-330 - high-velocity cloud, 20,000 light-years in diameter, 80% dark matter, and rotating. Possible dark galaxy.
  • Smith's Cloud - high-velocity cloud, 9,800ly by 3,300ly, at least one million solar masses. Possible dark galaxy, will collide with the Milky Way in 27 million years along the Perseus Arm.

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