“If humanity does not want to go the way of the dinosaurs, we need to study an event like this in detail,” says Qing-zhu Yin, professor in the department of earth and planetary sciences at University of California, Davis. Saying it was a “wake-up call,” Yin says the Chelyabinsk meteorite, the largest strike since the Tunguska event of 1908, belongs to the most common type of meteorite, an “ordinary chondrite.”