Comments:

raymond - 2004-10-04 16:00:03
In olden days a teacher would draw a large circle with scritching white chalk on the slate blackboard and proclaim, "Let the circle represent the size of Earth. The chalk line represents the size of the atmosphere around Earth."
Low tech made an impression.
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Laura - 2004-10-04 16:03:02
That's a clever way to do it. It's a bit alarming. I was gonna revive my dead car battery but I might just let it go for the winter.
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tom - 2004-10-05 13:26:55
The idea that the edge of space is 62 miles up is quite arbitrary, and has more to do with the fact that 100 kilometers is a nice round number than anything else (100 km = 62 miles). For more on this, see this article in Slate.
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Laura - 2004-10-05 13:33:18
That is a fascinating article, Tom--all about drawing a line in the undefinable...very interesting! Thank you. So it turns out they drew a number out of a hat in the 50's. Never knew.
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raymond - 2004-10-05 16:18:12
Charge the battery. Drive the car. There's plenty of atmosphere to handle unending combustion after all.

Did the same folks who drew lines in the sand to create present states in the lands of Araby draw the lines in space?
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Laura - 2004-10-05 16:21:15
Well, Raymond, I think you're kidding a bit (hard to tell in context-free blog sometimes) but I don't think there's plenty of air for unending combustion. Children's asthma rates are slowly rising and some think it's from a slow invisible rise of air pollutants.
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