Hongwei Yu

The Universe arranged a race of light beams. Fast radio bursts from distant galaxies made it possible to test: if the photon had mass, blue light would arrive later than red. In reality, the delay is explained only by gas. New mass limit: 5×10⁻⁵¹ kg – light is practically weightless.

Black holes are the record holders for compressing matter. But physicists have found a way for neutron stars to beat them in density: just add tiny corrections to the theory of gravity that kick in under extreme conditions. Calculations show that such ultra-dense stars are stable and can produce gra

Scientists described how magnetic fields in the early universe, like an invisible spoon, stirred spacetime, creating eddies that condensed into black holes. These holes could be a major component of dark matter.