Looking out into the Milky Way, it's possible to see all sorts of strange cosmic structures — tentacle-like spiraling arms of stars in the outer regions of the galaxy, dark clouds of gas and dust that block out whatever sits behind them and jets of radiation shooting out from the supermassive black hole in the center.
You might also notice blobs of densely packed regions of stars — galaxies within galaxies, if you will. Astronomers know these blobs of stars as globular clusters, and they've been trying to decipher exactly how these stellar neighborhoods come into existence and evolve through time.
