A perfectly spherical explosion, called a kilonova, that followed the merger of two very dense objects called neutron stars, remnants of massive stars after supernova explosions.(Albert Sneppen/Reuters)Two neutron stars moving at 100 million meters per second rammed into one another in space.In what experts called a "cosmic car crash," the stars merged and collapsed to form a black hole - while throwing out fragments that produced a perfectly spherical fireball of blue and red.
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