Four exoplanets in a nearby solar system could pinball off each other and careen off into outer space when the star they orbit dies, astronomers predict. 

Those four planets are part of HR 8799, a system 135 light-years away from Earth in the constellation Pegasus. These planets, each of which weighs more than five times the mass of Jupiter, orbit a star that is 30 million to 40 million years old.

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