The Solar System once had two suns, scientists believe, and one of them may have wiped out the dinosaurs.

A theoretical physicist at the University of California and an astronomer from Harvard University have discovered that most stars are born with a ‘brother’ and our own Sun is likely to be no exception.

In fact, this ‘evil twin’ which has been dubbed Nemesis, may have been responsible for kicking an asteroid into Earth’s orbit which led to the extinction of the dinosaurs.

In the 1980s, two paleontologists from the University of Chicago suggested that the regular rate of mass extinctions on Earth – every 26 million years – was caused by a mysterious extraterrestrial source. But, despite years of searching, nobody could ever find it.