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"We have found evidence that our Milky Way had an encounter with a small galaxy or massive dark matter structure perhaps as recently as 100 million years ago," Larry Widrow of Queen's University in Canada said.
"We clearly observe unexpected differences in the Milky Way's stellar distribution above and below the Galaxy's midplane that have the appearance of a vertical wave -- something that nobody has seen before."
Astronomers say their simulations suggest over the next 100 million years or so, our galaxy will "stop ringing" as the stars in the solar neighborhood revert back to their equilibrium orbits -- unless we get hit again.
"Our part of the Milky Way is ringing like a bell," as an aftereffect of some sort of cosmic entanglement, Brian Yanny of the U.s. Department of Energy's Fermilab said.