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comment Can extraterrestials detect our messages?
Valid question, but maybe more Skeptics-oriented than practical astronomy.
Apr
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comment What are the chances that a deadly asteroid will hit Earth in the next decade?
In Carl Sagan's Cosmos (Ep. Heaven and Hell?) he details much the same arguments, having the benefit (for those that learn that way) of moving picture visuals with a model solar system (not to scale, obviously; a limitation that he uses to emphasise his point). I'd recommend watching the full series to anyone.