<b>Milky Way</b> and <b>Andromeda</b> Galaxies: On a <b>Collision Course</b> | AMNH

The long-held belief that the Milky Way and Andromeda galaxies are on an inescapable head-on collision course has recently been challenged, with new data revealing only a 50/50 chance of a collision occurring within the next 10 billion years. While astronomers previously expected a definitive galactic crash in about 4.5 billion years, advanced computer simulations utilizing data from NASA’s Hubble Space Telescope and the ESA’s Gaia Mission indicate that the timeline and final outcome are far more uncertain than once thought.
Why the Forecast Changed
Previous mathematical models treated the Milky Way and Andromeda as an isolated, two-body system. However, a landmark study published in Nature Astronomy incorporated the gravitational influences of the Local Group’s smaller satellite galaxies. [1, 2]
  • The Triangulum Galaxy (M33): Tugs on the system in a way that actually increases the likelihood of a merger.
  • The Large Magellanic Cloud (LMC): Orbits on a path perpendicular to the Milky Way-Andromeda trajectory. Its immense gravitational pull acts as a cosmic steering wheel, potentially pulling the Milky Way out of Andromeda’s direct path and causing them to safely drift past each other
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