NASA's Fermi space telescope has uncovered evidence of a cosmic grudge match spanning millennia. Two supernova remnants appear to be siblings—stars that once orbited each other in a binary system. The first star exploded violently, sending its companion hurtling into space. After thousands of years of solitary flight, the surviving star also detonated in its own supernova. The discovery reveals how stellar violence unfolds across incomprehensible timescales, with binary systems choreographing a dance of destruction that spans the ages.

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