The Milky Way wasn’t always a spiral  —and astronomers may finally know why it ‘shape-shifted’

A 100-year-old thriller surrounding the “shape-shifting” nature of some galaxies has been solved, revealing within the course of that our Milky Method galaxy didn’t at all times possess its acquainted spiral look. 

Astronomer Alister Graham used outdated and new observations to point out how the evolution of galaxies from one form to a different takes place  — a course of often called galactic speciation . The analysis reveals that clashes and subsequent mergers between galaxies are a type of “pure choice” that drives the method of cosmic evolution.