Using the footage and the location of an impact into Lake Chebarkul, Jorge Zuluaga and Ignacio Ferrin, from the University of Antioquia in Medellin were able to use simple trigonometry to calculate the height, speed and position of the rock as it fell to Earth.

BBC: Russia meteor's origin tracked down

The satellite it carried fell back to earth, landing not far from the packing crate in which it arrived.

NPR: SpaceX Makes Progress with Rocket Test

Today, as ever, it has been about justice, for those 270 innocent American and Scottish citizens who fell to earth like so many doused stars on a cold night in late December.

CNN: Justice for Libya, and Pan Am victims