In February, 2013 a meteor exploded over the Russian city of Chelyabinsk in the southern Ural Mountains. Scientists at the time were watching a different meteor that was passing close to the Earth. No one was aware of the Chelyabinsk meteor because it came from the direction of the sun. The 60 feet in diameter, 10,000 ton meteor exploded about 25 miles south of the city center at a height of 18 miles. At that height, most of its force of the explosion was absorbed by the atmosphere. Still, the blast wave injured 15,000 people in the region, mostly from window glass, and damaged 7,200 buildings. There are a dozen excellent videos of the meteor streaking across the sky, mostly from dashboard cameras. Most drivers in Russia have dash cams to support their accident claims in the corrupt traffic courts. As the videos were studied, scientists warned that we had better improve our methods of detecting meteors or else we could go the way of th...
Start from scratch. Stick to common sense. Know your goals and means. —Achille Castiglinoni