4 Billion-Year-Old Oort-Cloud Comet 1000x Mass of the Impactor that Caused the Extinction of the Dinosaurs
This enormous comet — approximately 80 miles across, more than twice the width of Rhode Island — is heading our way at 22,000 miles per hour from the edge of the solar system. Fortunately, it will never get closer than one billion miles from the sun, which is slightly farther from Earth than Saturn; and that will be in 2031.