In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

Movies like "Disclosure Day" and "Project Hail Mary" renew our fascination with extraterrestrials and the idea that humankind ...

Aliens exist – they just haven't visited Earth, a NASA veteran has claimed. Dr Gentry Lee has worked at the US space agency since 1968, when he first got involved with the Viking mission to Mars. He ...