NGC 1851, also cataloged as Caldwell 73, is a massive globular cluster located in the southern constellation Columba. Situated about 39,500 light-years from the Sun and roughly 54,100 light-years from the Galactic Center, it is one of the more compact and concentrated globular clusters in the Milky Way. Its dense core contains hundreds of thousands of ancient stars, many of them more than 10 billion years old, offering a direct glimpse into the early history of our galaxy.

Captured from Rio Hurtado in Chile, this image resolves the cluster’s tightly bound core while revealing a halo of individual stars extending outward into space. The strong central concentration reflects the cluster’s advanced dynamical evolution, where gravitational interactions have driven stars inward over cosmic time. Set against a background of distant field stars and faint galaxies, NGC 1851 stands out as a luminous fossil of the Milky Way’s formative years, preserving clues about stellar evolution and galactic assembly.