Last month marked the 111th anniversary of the Tunguska event, a blast that flattened trees across half a million acres of Siberian forest on June 20, 1908. Scientists have been puzzling over the details ever since. We now have fresh evidence about what transpired back then, in the form of new data gleaned from a well-documented rare meteor burst near Chelyabinsk, Russia, in February 2013. That data shores up the hypothesis that the Tunguska event was most likely due to an asteroid impact. The findings are described in a series of scholarly papers commemorating the event, published in a special July 15 issue of the journal Icarus.
Seismometers all over