Andromeda on collision course with the Milky Way

@article{Cowen2012AndromedaOC,
  title={Andromeda on collision course with the Milky Way},
  author={Ron Cowen},
  journal={Nature},
  year={2012}
}
  • R. Cowen
  • Published 31 May 2012
  • Physics
  • Nature
The two galaxies will meet head-on in 4 billion years, astronomers say. 
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References

WATER MASERS IN THE ANDROMEDA GALAXY: THE FIRST STEP TOWARD PROPER MOTION
We have detected and confirmed five water maser complexes in the Andromeda Galaxy (M31) using the Green Bank Telescope. These masers will provide the high brightness temperature point sources needed