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Stellar stream 

A stellar stream is an association of stars orbiting a galaxy that was once a globular cluster or dwarf galaxy that has now been torn apart and stretched out along its orbit by tidal forces.

List of stellar streams

This list is incomplete; you can help by expanding it.
Known streams in the Milky Way[1]
Name Origin Mass
(Solar masses)		 Length
(light years)		 Composition Discovery year
Arcturus stream Defunct dwarf galaxy Unknown Unknown Old stars deficient in heavy elements 1971
Magellanic Stream Large and Small Magellanic Clouds 200 million 1 million Hydrogen gas 1972
Sagittarius stream Sagittarius Dwarf Elliptical Galaxy 100 million 1 million Wide variety of stars 1994
Helmi stream Defunct dwarf galaxy 10 to 100 million Several complete loops around the Milky Way Old stars deficient in heavy elements 1999
Palomar 5 stream Globular cluster Palomar 5 5000 30,000 Old stars 2001
Virgo stream defunct dwarf galaxy 30,000 2001
Monoceros ring Canis Major dwarf galaxy 100 million 200,000 Intermediate-age stars 2002
Anticenter stream Defunct dwarf galaxy Unknown 30,000 Old stars 2006
NGC 5466 stream Globular cluster NGC 5466 10,000 60,000 Very old stars 2006
Orphan stream Ursa Major II dwarf galaxy 100,000 20,000 Old stars 2006
Globular cluster 2007[2]
Globular cluster 2007[2]
Defunct dwarf galaxy 2007[2]
Known streams in the Andromeda Galaxy
Name Origin Mass
(Solar masses)		 Length
(light years)		 Composition Discovery year

References

  1. ^ Ibata, Rodrigo; Gibson, Brad (April 2007). "The Ghosts of Galaxies Past". Scientific American: 40–45. 
  2. ^ a b c "Rings around the galaxy", Astronomy (June 1, 2007). Retrieved on 2007-06-07. 
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Stellar systems
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Stellar stream  · Stellar association  · Moving group  · Multiple star  · Asterism  · Runaway star
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