In "The Making of Star Trek" Roddenberry explains that he was aware of the Drake equation while he was writing the pitch but didn't actually have it on hand to include, so he made up a complicated-looking equation to give credence to his premise!
As has been stated above several times already, in HTML (which is what all of the web is), it doesn't matter if you type fifty spaces in a row, it'll appear as one space. So all of the double-spacers are doing it for nothing whenever they post anything to the web.
In "The Making of Star Trek" Roddenberry explains that he was aware of the Drake equation while he was writing the pitch but didn't actually have it on hand to include, so he made up a complicated-looking equation to give credence to his premise!