The Milky Way's Mysterious Glow at Its Centre

The mysterious glow at the centre of the Milky Way is a persistent astrophysical puzzle, manifesting as an excess of gamma-ray radiation that has intrigued scientists for nearly two decades. This enigmatic luminosity shines from the galaxy’s core in a pattern not fully explained by known sources.
 
Two leading hypotheses compete to explain this glow. One influential theory proposes that the gamma rays are produced by dark matter particles annihilating each other when they collide near the galactic core. Recent supercomputer simulations suggest dark matter is arranged in a flattened, not spherical, shape at the Milky Way’s centre, matching the bulge of the observed radiation. This bolsters the possibility that dark matter, the mysterious substance comprising over a quarter of the universe’s mass, may finally reveal itself through such a signal.
 
The second major contender attributes the glow to millisecond pulsars, which are rapidly spinning neutron stars, the dense remnants of supernova explosions that emit high-energy gamma rays. While the spatial distribution of the glow aligns with the star-rich galactic bulge, suggesting a link to these objects, astronomers have identified too few pulsars to decisively confirm them as the sole source.
 
Advanced simulations, factoring in the Milky Way’s turbulent formation and galaxy collisions, have recently shown that both dark matter and pulsar scenarios could feasibly produce the observed glow. The newly proposed flattened dark matter core, shaped by the galaxy’s early mergers, neatly fits the gamma-ray pattern detected by NASA’s Fermi telescope, revitalizing the dark matter explanation. Nevertheless, as Joseph Silk and other leading researchers note, current evidence does not conclusively favour one theory; the excess could be split roughly 50/50 between dark matter and ancient stars. Future experiments, particularly those capable of distinguishing the precise energy of the gamma rays may help uncover a definitive answer and, potentially, the first direct proof of dark matter’s existence.
 
Solving the mystery of the Milky Way’s glowing heart would mark a major advance in cosmology and astrophysics, either confirming long-standing predictions about dark matter or revealing new insights about stellar evolution and galactic dynamics. For now, the glow remains one of the universe’s biggest enigmas, driving continued innovation in both observation and theory.
 
References
Feldman, A. (2025, October 23). Mysterious Glow at the Milky Way’s Center Could Reshape a Major Cosmic Theory. LiveScience.
 
(2025, November 5). Dark Matter May Be Lighting Up the Heart of the Milky Way. Science Daily. https://www.sciencedaily.com/releases/2025/11/251104094152.htm

​(2025, October 17). Galactic Center GeV Excess. In Wikipedia, https://en.wikipedia.org/wiki/Galactic_Center_GeV_excess