Yep. But the thing is,research on Earth doesn't mean proper research into ancient cities, culture and technology. People still have hard time understanding that there was electricity in ancient times. We have found interesting batteries made out of sealed clay pots.
There is a lot of things that are not researched properly because they are "unacceptable" for society in majority of scientific circles.
In science as well as in religion, there are hard core believers and they would refuse to believe something other then their own "GOD" or favorite dead scientist...