What if they are both true?
Recently scientist discover a possible habitable exoplanet Gliese 581g
http://en.wikipedia.org/wiki/Gliese_581_g
There is "100%" chance of life there.
Maybe that's what happen to Earth many many years ago. Some alien (or god) of higher intelligent found this planet. However the environment may be similar but not habitable by them directly. So they send/ "Created" human (or early form of human). A combination of local life form(pig or ape) so as to let it evolve under local environment. They then some how try to communicate to us through "divine" means. Assuming they cannot overcome the distant of at least 20 light years too.
Then multiple tries created multiple versions, and maybe after multiple 100 of years then they can send and receive information on our progress.
Just a thought!
