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13 lines
1.1 KiB
Markdown
13 lines
1.1 KiB
Markdown
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author: Eric Wagoner
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date: '2002-07-24T09:55:14'
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description: The Palermo Scale is used by astronomers to measure the risk imposed
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to earth by an asteroid. It's a logarithmic scale with values ranging (roughly)
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from -7 to +7. Anything less than -2 can be ignored, and those between -2 and zero
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merit careful monitoring. For the first time, an object with a value greater than
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zero has been discovered.
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draft: false
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title: Impact threat
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---
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[The Palermo Scale](http://www.jpl.nasa.gov/neo/risk/doc/palermo.html) is used by astronomers to measure the risk imposed to earth by an asteroid. It's a logarithmic scale with values ranging (roughly) from -7 to +7. The specks of dust that hit us every day are at the low end and the dinosaur killer-type would be at the high end. Anything less than -2 can be ignored, and those between -2 and zero merit careful monitoring. For the first time, [an object with a value greater than zero](http://news.bbc.co.uk/2/hi/science/nature/2147879.stm) has been discovered -- 0.06. Further observations will modify this, hopefully back into negative territory. I went to post this to MetaFilter, but they're [already on the case. |