According to Al Jazeera Arabic, scientists long believed that comets contributed to the emergence of life on Earth. Al Jazeera Arabic reported that recent studies, based on 100,000 computer simulations, suggest that violent comet impacts may have destroyed material brought from space. The report did not name the researchers or the institution that conducted the studies, or give details of the precise methodology and results. It also did not say whether the studies had undergone peer review.