Milky Way Distorts Toward Collision With Large Magellanic Cloud After 10 Billion Years of Calm
Updated
Updated · The Conversation · Jun 10
Milky Way Distorts Toward Collision With Large Magellanic Cloud After 10 Billion Years of Calm
3 articles · Updated · The Conversation · Jun 10
Summary
The Milky Way is already stretching and recoiling under the pull of the Large Magellanic Cloud, setting up an accelerating approach that researchers describe as an eventual collision.
The disturbance is hitting the galaxy’s dark-matter halo first: the LMC, the Milky Way’s most massive companion, is tugging the outer halo out of shape and altering stellar motions.
Gaia’s map of nearly 2 billion stars lets astronomers trace those motions in detail, separating native stars from migrant populations and reading the galaxy’s merger history from their orbits and chemistry.
That record shows the Milky Way was last radically reshaped 8 to 11 billion years ago by the Gaia-Sausage-Enceladus merger, which tilted the disc and rewired the halo.
The new LMC-driven encounter suggests the Milky Way’s long quiet phase is ending, with fresh clues expected about how galaxies evolve and how dark matter is distributed around them.