Billions of light years away in a remote part of the universe, two neutron stars - the ultradense remnants of dead stars - collided. The catastropic Billions of light years away in a remote part of the universe, two neutron stars - the ultradense remnants of dead stars - collided. The catastropic cosmic event sent light and particles, including a sudden flash of gamma rays , streaming through the... [3852 chars]