Chicxulub impact structure
Dinosaur-killing impactor likely came from outer asteroid belt
Oldest known asteroid impact may have played role in ending ancient ice age
Link found between comet/asteroid showers and mass extinctions
For more than 30 years, scientists have argued about a controversial hypothesis relating to periodic mass extinctions and impact craters on Earth caused by comet and asteroid showers. Now scientists conclude that these events show a cyclical pattern over the studied period, with both impacts and extinction events taking place every 26 million years.