Astronomers at MIT and elsewhere have used a massive cluster of galaxies as an X-ray magnifying glass to peer back in time, to nearly 9.4 billion years ago. In the process, they spotted a tiny dwarf galaxy in its very first, high-energy stages of star formation.
![](https://scx1.b-cdn.net/csz/news/tmb/2019/galaxy.jpg)
Source:
https://phys.org/news/2019-10-astronomers-giant-galaxy-cluster-x-ray.html