Scientists May Have Finally Found Evidence That “Empty” Space Isn’t Really Empty | #vacuum birefringence # empty space quantum physics # quantum vacuum # magnetar # 1E 1547.0-5408 # vacuum birefringence 2026 # quantum electrodynamics # polarized X-rays # IXPE # neutron star # magnetar magnetic field # quantum physics discovery # space science # X-ray polarization # Nature astronomy