NASA's Hubble Space Telescope has released an image showcasing over 500,000 stars within Messier 3 (M3), a globular cluster in the Milky Way.This striking portrait, created to celebrate the United States' 250th anniversary, highlights M3's significance as a cosmic time capsule.The cluster contains rare RR Lyrae variable stars, which help astronomers measure distances by their predictable brightness cycles.Additionally, M3 hosts blue stragglers—stars that appear younger than their peers due to gravitational interactions.Scientists believe these anomalies may stem from a past cosmic merger between two globular clusters.

Hubble's detailed observations contribute to understanding the Milky Way's evolutionary history, as these ancient star systems preserve records of galactic formation.

The image is part of a broader Hubble Treasury program surveying half of the galaxy's known globular clusters, offering insights into how the Milky Way evolved over billions of years.