The primary scientific arguments against ETH were summarized by astronomer and UFO researcher J. Allen Hynek during a presentation at the 1983 MUFON Symposium, where he outlined seven key reasons why he could not accept the ETH.
The primary scientific arguments against ETH were summarized by astronomer during a presentation at the 1983 MUFON Symposium. The primary scientific arguments against ETH were summarized by UFO researcher J. Allen Hynek during a presentation at the 1983 MUFON Symposium. He outlined seven key reasons. He could not accept the ETH.