Sandia National Laboratories researchers have concluded that the asteroid that spectacularly blasted trees over Tunguska, Siberia, on June 30, 1908, was much smaller than earlier estimates suggested.
A supercomputer simulation shows the asteroid's mass turned into an expanding jet of high-temperature gas traveling at supersonic speeds, the Albuquerque, N.M.-based lab said in a December statement.
"That such a small object can do this kind of destruction suggests that smaller asteroids are something to consider," principal investigator Mark Boslough said. His advice: "We should be making more efforts at detecting the smaller ones than we have till now."