Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
When it comes to"busting" cosmic ghosts, only the most extreme objects in the universe may be up to the task: neutron stars.
These new simulations of neutron star mergers were performed by Penn State University physicists, and ultimately showed that the point at which these dead stars meet becomes incredibly hot and dense. In fact, it becomes extreme enough to ensnare a bunch of those"cosmic ghosts."would get trapped at that neutron-star-merger interface and become much hotter than the relatively cold hearts of the colliding dead stars.
An illustration shows the death of a massive star in a supernova explosion that birthed a neutron star or black holeThe result of this series of collapses is a dense dead star, or neutron star, with between one and two times the mass of the original star — crammed into a width of around 12 miles . For context, the matter that comprises neutron stars is so dense that if a tablespoon of it were brought to Earth, it would weigh about as much as Mount Everest. Perhaps more.
A simulation of a binary neutron star merger. Neutrinos created in the hot interface between the merging stars can be briefly trapped and remain out of equilibrium with the cold cores of the merging stars for 2 to 3 milliseconds.The Penn State team's simulations revealed for the first time that, for a brief moment, the heat and density generated by a neutron star collision are enough to trap even neutrinos, which in all other circumstances have earned their ghostly nicknames.
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