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Astronomers say a red dwarf star and its brown dwarf companion passed within a light-year of our own sun 70,000 years ago, moving through the comets in the outer reaches of the Oort Cloud that surrounds our solar system.
The star is known as WISE J072003.20-084651.2, or Scholz's star. Today, it's 20 light-years away from us in the constellation Monoceros. But in a study published by Astrophysical Journal Letters, researchers say it passed right by us at a distance of 5 trillion miles (8 trillion kilometers, or 52,000 astronomical units, or 0.8 light-years). No other star has been known to come that close.
Scholz's star would typically be too faint to be seen with the naked eye from Earth, even during the close encounter. But the research team, led by the University of Rochester's Eric Mamajek, says there's a chance that our ancestors in Africa might have seen a magnetically induced flare-up.
originally posted by: Indigent
... so cool imagine if at that time the system had life and planed a visit to the place they would near miss, less than 1 light year away makes ancient aliens not so impossible, if all the millions things that have to happen did happen of course, but cool anyways...
The answer to "How close does a star have to come into the solar system to perturb enough to trigger comets coming into the inner solar system?" A star within a parsec or so could perturb "some" comets towards coming into the inner solar system, but there are fewer comets in the Oort Cloud that far out to perturb.