According to ancient alien theorists, extraterrestrials
with superior knowledge of science and engineering
landed on Earth thousands of years ago, sharing their
expertise with early civilizations and forever changing
the course of human history.

If aliens visited Earth in the past, could they make
an appearance in the future? For ancient alien theorists,
the answer is a resounding yes. They believe that,
by sharing their views with the world, they can help
prepare future generations for the inevitable encounter
that awaits them.