Re: There must be a second Earth...
People are forgetting All Along the Watchtower. Anders played it on Earth... it came from Earth, it's based on our reality. This is our planet. If they were all Cylons, then so are we.
Or - its set far in our future
"You are not controlling the storm, and you are not lost in it. You are the storm." - Sam Harris
"The object of opening the mind, as of opening the mouth, is to shut it again on something solid." - GK Chesterton