Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  If the near-Earth asteroid Bennu were to collide with Earth in the future, the space rock could cause substantial global damage, even though it’s a fraction of the size of the asteroid that wiped out the dinosaurs , according to new research. Astronomers estimate that Bennu has a 1 in 2,700 chance of affecting Earth in September 2182, which