http://www.lockergnome.com/decisions/2012/03/23/can-you-use-the-internet-to-predict-an-alien-invasion/ - To set the stage, suppose you are outside at night with some friends, or a potential special friend that you want to impress in a private way. You start the event by saying you have a hunch about a nova that might light up the night sky right there (pointing). Novae are rare and very special, so seeing one would be the treat of a lifetime. As you point, a sudden light appears right there in the sky, and it is more than 10 times as bright as Venus at its brightest! The light lasts for a few seconds while your audience gasps and then disappears. "Not much so far as novae go..." you shrug, assume a nonchalant air, and immediately change the subject. With luck, they will not notice a slight motion of the light, which would immediately show that it was not a star, but a satellite. But how can you predict when a satellite will be going overhead at that exact moment?
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