Nearly Cosmic‑Age Globular Cluster Discovered Near Milky Way’s Center

Researchers have measured the age of the globular cluster VVV CL001, which lies concealed behind thick interstellar clouds close to the Milky Way’s centre, at about 13.4 billion years—making it one of the oldest star clusters in our galaxy and only a few hundred million years younger than the universe’s roughly 13.8‑billion‑year age.

This compact, metal‑poor cluster—a characteristic of first‑generation stars—resides deep in the densely populated central zone of the Milky Way. Massive dust layers block visible wavelengths, making VVV CL001 undetectable to conventional optical surveys and explaining why it was only identified recently despite being near the Galactic nucleus.

The team derived the cluster’s age using the near‑infrared power of the VISTA Variables in the Via Lactea (VVV) survey, which can cut through the intervening dust. They gauged the luminosity and hue of its member stars and matched these observations to stellar‑evolution models, arriving at a birth time merely a few hundred million years post‑Big Bang. The cluster’s low metal content—signifying a dearth of elements heavier than helium—adds further weight to its origin in the early universe.

Discovering an object of this antiquity within the Milky Way’s inner halo has significant repercussions for theories of galactic evolution. Globular clusters act as fossil archives of the environment during the first stages of galaxy formation. Such an extreme age implies that massive star clusters inhabited the Galaxy’s core only shortly after the universe’s inception, providing an additional benchmark for models that chart the Milky Way’s growth from smaller constituents.

The finding also highlights the difficulties astronomers encounter while examining the dust‑enshrouded Galactic centre. Optical instruments suffer from extinction, and although infrared techniques can pierce the veil, they demand careful calibration to distinguish foreground stars from true cluster constituents. Forthcoming assets like the James Webb Space Telescope and next‑generation ground‑based telescopes with adaptive optics are expected to deliver even finer infrared imaging, which could uncover additional concealed clusters and tighten age determinations.

Upcoming efforts will aim to obtain high‑resolution spectra of VVV CL001’s stars, enabling a more detailed mapping of their chemical signatures. These observations could shed light on early‑universe nucleosynthesis and assess whether this cluster shares a lineage with other primordial globulars. As scientists keep stripping away the interstellar dust veil, the Milky Way’s ancient core may reveal additional insights into the chronology of cosmic structure formation.