There is evidence of a high civilization.

Yet if that was true, came the nagging question, why was there no evidence of an industrial-technical civilization?

There are two ways that astronomy might find evidence of an extraterrestrial civilization.

Surely we're looking at evidence of a civilization that you could compare to Mesopotamian or Andes culture.

Marcel couldn't bring himself to believe that all evidence of a high-tech civilization could just disappear.

Despite ample evidence of a highly developed ancient civilization in Pakistan and Northwest India, scholars remain uncertain about what people created those cities.

They found every possible evidence of a civilization beside which that of Earth was intolerably backward.

All about were evidences of a dying civilization.

However, there is also evidence of an advanced civilization from a much earlier era.

"There's massive evidence of a past humanoid civilization here," Roger said.