Autonomous, self-replicating robots -- exobots -- are the way to explore the universe, find and identify extraterrestrial life and perhaps clean up space debris in the process, according to a Penn State engineer, who notes that the search for extraterrestrial intelligence -- SETI -- is in its 50th year.

It's possible that many of the remarkable UFO sightings reported throughout the ages might be attributed to intelligent, self-replicating, autonomous ET robots, or Von Neumann probes, visiting Earth. To read more, click here.