g a shock wave that smashed windows, damaged buildings and injured l,200 people. people heading to work in chelyabinsk heard what sounded like an explosion, saw a bright light and then felt the shock wave. according to russian space agency roscosmos, the fireball, travelling at a speed of 30km per second, had burnt very brightly across the horizon, leaving a long white trail that could be seen as far as 200km away. car alarms went off, thousands of wi
