Globular star clusters are favorite targets for amateur sky watchers. To the naked eye they appear as fuzzy-looking stars. Through a small telescope they resolve into glittering snowball-shaped islands of innumerable stars crowded together. About 150 globular star clusters orbit our Milky Way, like bees buzzing around a hive. They are the earliest homesteaders of our galaxy, containing the universe's oldest known stars.
Hubble is so powerful it can see globular star clusters 300 million light-years away. And, a lot of them. Peering into the heart of the giant Coma cluster of galaxies Hubble... Read more