A mysterious glow of gamma rays from the centre of the Milky Way has reignited debate over dark matter. The unexplained radiation, first detected by NASA's Fermi Gamma-ray Space Telescope, appears stronger than what can be explained by known cosmic processes or stellar objects within the galaxy.
Dark matter is believed to make up about 27 to 30 per cent of the universe, yet it has never been directly detected. Some researchers suggest the glow could be a sign of dark matter particles colliding and producing gamma rays, while others argue it is more likely caused by ordinary astrophysical sources such as pulsars.
