A Hubble Space Telescope color image of the core of the globular star cluster Omega Centauri is used to construct a Hertzsprung-Russell diagram of the stellar populations in the cluster. When stars are sorted by brightness and color they can be used to create a graph that astronomers use to trace stellar evolution.

"Making a Color-Magnitude Diagram for Globular Cluster Omega Centauri"
– Microsoft PowerPoint presentation by J. Anderson

Credit: NASA, ESA, and J. Anderson, R. van der Marel, G. Bacon, and M. Estacion (STScI)

Publication: October 26, 2010