New research indicates that the most recent major collision in our galaxy occurred billions of years later than previously believed.Using data from the Gaia spacecraft, researchers found that the Milky Way's last major galactic collision happened less than three billion years ago, not the eight to 11 billion years previously thought...Newberg, a renowned astrophysicist and Milky Way expert, and Donlon focused on the so-called "wrinkles" in our galaxy, which are formed when other galaxies collide with the Milky Way...By comparing their observations of the wrinkles with cosmological simulations, the team was able to determine that our last significant collision with...