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> "By the time the signals get to Earth, they are a fraction of a billion-billionth of a watt."

Check my math but one billionth of a Watt is 1 nW. So one billion-billionth of a Watt is 1 atto Watt?

It's a shame that Voyager doesn't carry some tiny nuke bombs to mark its positions. The SNR at a billion-billionth of a watt level is terrible.

An excerpt from a course I recently attended: http://i.imgur.com/6VW4X3o.png

The noise floor of the Goldstone Observatory is truly incredible.