Astronomy
The Formation and Evolution of Globular Clusters
Quick fact
The globular cluster Messier 80 is about 12 billion years old, meaning its stars formed when the universe was only about a billion years old.
Why this is interesting
You've likely seen images of glittering clusters of stars, but did you know that some of these spheres contain some of the oldest stars in the universe—nearly as old as the universe itself? How can such ancient, dense groups of stars form and then survive for over 13 billion years?