I'd say about twenty half-giraffes*.
*It's a custom measure recently used by a British astronomer to describe a meteorite that hit Earth hours after being discovered. Just repeating the news I heard from other social media people.
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There's a Bridge, across a river, near me. I live near where MIT is. The famous University.
Well, as a prank. decades ago, they invented a unit of measurement, called the Smoot:
they measured the bridge length, by taking one of their classmates and laying him down, over and over, to see how many Smoots (his name) long the bridge is. now, it is an MIT standard.
Awesome to know that, too :)