Our Milky Way galaxy was not always a spiral. Here's how it changed shape
A century-old mystery of how galaxies shift shapes has been solved by considering "survival of the fittest" collisions between cosmic titans also revealing the Milky Way was not always a spiral.
Alister Graham Monthly Notices Of The Royal Astronomical Society Milky Way Hubble Space Telescope Spitzer Space Milky Way Andromeda
Source: yahoo.com