Galaxy’s petal-like structures came from collision
A cosmic crash of two huge masses of stars, gas and dust probably gave way to structure of star clusters
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/10/ay_heic1318a_860_free.jpg?fit=860%2C460&ssl=1)
GETTING SLAMMED The concentric shells of PGC 6240 (shown) and the young star clusters that orbit it may have formed when the galaxy smashed into another one.
Judy Schmidt/Hubble’s Hidden Treasures, Hubble, ESA, NASA