“I am afraid of my visions.” Thus spoke H.R. Giger, the artist whose paintings led to him being engaged by director Ridley Scott to design the xenomorph for the first Alien film in the late 1970s.

Harvard scientist Avi Loeb earnestly hopes that the interstellar alien object in the solar system turns out to be a spacecraft sent by extraterrestrial beings. This comes after his very open assertion ...