Props to Phil Plait for much of the math. And checking the rest. Of the math. Go buy Death from the Skies!. It's where I got much of the info.
Big Distance - Talk from Ignite Phoenix 3
If you're not familiar with the Ignite format, here's all you need to know. 20 slides. 5 minutes. Go. The most fun you'll have presenting anything you want.
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