Quote:
Originally Posted by Edward M. Grant
Naming gets confusing otherwise, because every alien race calls their planet 'Dirt' or 'Ground' or some other kind of variant on 'Earth'.
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A fan of Nick Pollatta and Phil Phoglio, are you?
There's a discussion of this issue here:
http://tvtropes.org/pmwiki/pmwiki.php/Main/PlanetTerra
The short answer: because it sounds cooler than "Earth" and is used in more than one language.