Advanced Civilization May Have Lived in Our Solar System Before Us, Scientist Says
 

You probably aren’t familiar with the name Jason T. Wright, but you’re probably familiar with his work. He’s the Penn State astronomer who put out the theory that there may be an alien megastructure being built around a star that is 1,500 light years away. That strange star must have given him a few ideas, because Wright has just published a paper that suggests there could have been an advanced civilization in our solar system before humans emerged.

He believes that “A prior indigenous technological species might have arisen on ancient Earth or another body, such as a pre-greenhouse Venus or a wet Mars.” However, the real crux of his paper is not just if there was an advanced race here before humans emerged, but how we would go about finding evidence of this hypothetical species...click on thumbnail for more