The center of the Milky Way glows with GeV gamma rays that no catalogued source population fully explains. The Galactic Center Excess, identified in Fermi-LAT data around 2009 and confirmed by every reanalysis since, is roughly spherical, extends 10 degrees or more from the center, peaks near 2 GeV, and carries a luminosity of order 10^37 erg/s. Its spectrum and morphology match, almost embarrassingly well, the predictions for annihilating WIMP dark matter of 40 to 70 GeV: for a decade it was the most credible dark matter detection claim in astronomy. The alternative is a population of thousands of unresolved millisecond pulsars in the Galactic bulge, whose collective spectrum happens to resemble the annihilation signature.
The discriminating statistics have swung toward pulsars: photon-count fluctuation analyses found the emission clumpy rather than smooth (Lee et al.; Leane and Slatyer's subsequent work exposed method fragilities, keeping the question open), and the excess morphology tracks the boxy stellar bulge rather than the spherical halo annihilation requires (Macias et al.). Meanwhile the annihilation interpretation has lost its independent support: the same WIMP parameter space is excluded by LUX-ZEPLIN direct detection and dwarf spheroidal gamma-ray nulls, demanding either dark matter that annihilates in the Galactic Center but hides everywhere else, or acceptance that the model's flagship indirect signal is astrophysics.
The standing is an unresolved attribution with the burden shifted: the pulsar interpretation requires a bulge population not yet directly counted, the dark matter interpretation requires evasions elsewhere, and radio surveys (MeerKAT, SKA) hunting the predicted millisecond pulsars will settle the inventory.