Others thought they could come from massive stars collapsing to become black holes. In fact, scientists wondered if quasars, supernovae, pulsars, and even globular clusters could be the cause of ...

Heavy duty A high-energy photonic jet (white and blue) blasts through a collapsing star with a black hole at its centre. The cocoon where free neutrons may be available for the r-process is shown in ...

Watch the evolution of a jet formed by a collapsing star ("collapsar") in these simulations courtesy of Ore Gottlieb/Northwestern University. The wobble of the jets may be the source of mysterious ...