A lot is known about galaxies. We know, for instance, that the stars within them are shaped from a blend of old star dust and molecules suspended in gas. What remains a mystery, however, is the process that leads to these simple elements being pulled together to form a new star.
![](https://scx1.b-cdn.net/csz/news/tmb/2021/newgalaxyshe.jpg)
Source:
https://phys.org/news/2021-01-galaxy-stars.html