It is believed that approximately 66 million years ago, an asteroid wiped out almost three-quarters of all plant and animal species on Earth including the dinosaur population.
However, according to a study published in Scientific Reports, Harvard astronomers have presented a new analysis. They believe, it was a special kind of comet, originating from the edge of our solar system that triggered the catastrophic mass extinction.
The sun's forces fragmented this comet, which then collided with the Earth.
The study further states that these impacts could occur every 250 million to 750 million years.