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Tech journalist since the dark ages. Windows Secrets, LangaList newsletter, Windows Magazine (NetGuide, Home PC), Byte, Popular Computing, yadda yadda yadda. Google me, if it matters.

This feed is mostly personal interest; it's NOT my professional writing. There's tech here, yes, but also lots of general science and some politics and weird humor thrown in.

Friday, March 27, 2015

Meteorite chunks create "snow carrots" in Russia

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.

For example:

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.

"'Not just the windows were broken, but the window frames were pushed in, in the buildings,' said Jenniskens in a Science podcast. 'The [shockwave] was so strong that it was able to topple over people standing.'
--- http://news.nationalgeographic.com/news/2013/11/131106-russian-meteor-chelyabinsk-airburst-500-kilotons/