The asteroid responsible for the mass extinction event that ended the reign of the dinosaurs 66 million years ago did not originate from the more familiar inner regions of our solar system. Instead, new research reveals that this catastrophic asteroid came from the distant reaches of the solar system. According to a study published Thursday in Science, researchers from … [Read more...] about Asteroid That Killed the Dinosaurs Was Water-Rich and Traveled Far Before Slamming Into Earth