Dinosaurs were not wiped out by a catastrophic asteroid impact on Earth, scientists have claimed in a bombshell new study. It has long been believed that dinosaurs were wiped out after an Everest-sized asteroid smashed into Earth at around 45,000mph, which is thought to have destroyed everything within a 900-mile radius. However, a team of Purdue University planetary scientists believe a number of dinosaurs survived the initial impact, but were subsequently killed by a cloud of ejected dust. TRENDING Stories Videos Your Say This fine dust which blanketed the planet blocked heat from the impact escaping the atmosphere - meaning Earth cooked from the inside. “Without the dust cloud, it would have been bad.