Everyday Units
They are talking on the BBC about an asteroid passing the earth tonight as being the size of an Olympic swimming pool. There’s more here.
Why are objects always Olympic swimming pools, London buses or football pitches?
Incidentally, an astronomer has said that this asteroid is possibly about the size of the one that landed in Tunguska in 1908. Although of course no-one can be sure.
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The Anonymous Widower 
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