Extraterrestrial: Alien Life

If extraterrestrial beings do exist, they have probably already visited our world throughout the past and continue to observe our human development today. The life-forms and/or their spacecraft could be merely a product of vivid imaginations, unusual effects created by atmospheric conditions, astronomical phenomena, or even arising from supernatural causes... However this explanation is unconvincing in light of the many reported encounters that remain inexplicable.

This book traces the progr...