|Only 0.02% of last year's huge Chelyabinsk Meteor was ever recovered --- most of it vaporized or scattered into unrecoverable particles --- but scientists are still learning from it.
When hot meteorite fragments hit snow, they melt a vertical shaft or tunnel to the ground. The melted walls of the shaft re-freeze, and the resulting ice wall is denser than the surrounding snow. When the lighter snow melts, the harder-to-melt ice shaft is temporarily left behind as a hollow, standing cylinder.
"The February meteor blast over central Russia glowed 30 times brighter than the sun, sunburned observers, and delivered the biggest astronomical punch felt on Earth in a century, report scientists.
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