Current theories might be wrong about how a galaxy evolves
 

With the help of NASA's Hubble Space Telescope, researchers made a surprising discovery that goes against what we thought we knew about old galaxies and how they evolve. Our galaxy, the Milky Way, is a disk-shaped spiral galaxy. Typical of this shape...

https://www.engadget.com/2017/06/23/...alaxy-evolves/