It Would Take About 100 Billion Years for Another Star to Pass Close Enough to Make the Solar System Unstable universetoday storybywill
As Brown explained to Universe Today via email, this is particularly true of stars like the Solar System during its early history:
Another widely-accepted theory is that our Sun formed roughly 4.5 billion years ago as part of a star cluster that it long since left. With these theories in mind, Brown and Rein investigated how being part of a cluster could have altered the Solar System once its planets formed and were part of an established system. They found that the role played by stellar flybys depends on how strongly the passing star can disturb the system.
To even begin to get reasonable statistics, Brown added, researchers need to conduct thousands of different simulations. There are two ways to do this: running the simulations on a single computer for up to 70 years or more, or using thousands of different computers simultaneously for a month. This not only makes statistical analysis very complicated but also very expensive.
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