Nemesis is a theoretical dwarf star thought to be a companion to our sun. The theory was postulated to explain a perceived cycle of mass extinctions in Earth’s history. Scientists speculated that such a star could affect the orbit of objects in the far outer solar system, sending them on a collision course with Earth.
While recent astronomical surveys failed to find any evidence that such a star exists, a 2017 study suggests there could have been a “Nemesis” in the very ancient pas