Did our Sun have a companion star some long, long time ago? According to new research, it seems like all stars are born in pairs. The scientists believe that the Sun’s companion (called Nemesis) has departed our cosmic neighborhood not long after the Sun formed:
This is quite the statement! I would say that it’s about the same level of magnitude as claiming that the Earth is not flat or that it rotates around a star. It really changes the way we have thought about solar system formation and will impact our estimations regarding planets able to support life. That’s because planets orbiting close binaries may experience severe weather swings while planets orbiting wide binaries would suffer from increased chances of asteroid bombardment.