The Milky Way has a 'kink' or warp in its disc that 'wobbles like a spinning top' and it could have been created by an ongoing collision with a nearby dwarf galaxy. It was first discovered in the late 1950s but astronomers haven't been able to determine exactly what caused the misshape in the galactic disc until now. This is a close neighbour responsible for a number of collisions with the Milky Way. Sagittarius is believed to have burst through the Milky Way’s galactic disc several times in the past. Gaia has already helped scientists discover other major collisions between the Milky Way and neighbouring galaxies over its long history.

Source: Daily Mail March 03, 2020 11:39 UTC