According to a study, Harvard researchers have found that dinosaurs might have been killed off by a comet instead of an asteroid. A Comet is a celestial object that consists of a nucleus of ice and dust. It originated from a group of icy objects located on the edge of the solar system. While an asteroid is a rock piece that orbits the Sun. They are mostly found in the Asteroid Belt.
The study, published in the CNN International, said that a piece of comet crashed into Earth some 66 million years ago to create Chicxulub crater, which is linked to the Cretaceous-Paleogene extinction event that wiped off the dinosaurs and many other species.
While other researchers disagree and still have claimed that the Chicxulub crater, located on the Yucatán Peninsula of modern day Mexico was created by an asteroid. Natalia Artemieva, senior scientist at the Planetary Science Institute, who was not part of the new study, said the comet piece would have been too small to make the crater.
According to the study, the estimated size of the comet piece is nearby 4 miles wide, while Natalia Artemieva said the comet would have to be at least 7.5 miles wide to make a crater.
David Kring, principal scientist at the Lunar and Planetary Institute in Houston, who was also not part of the new comet study said, there is absolutely no evidence that proves their model is incorrect, but on the other hand, there is a lot of evidence that is still pointing to an asteroid being the most likely impactor.