The search for extraterrestrial life has evolved from philosophy to a serious scientific and national security concern ...

A provocative theory circulating among artificial intelligence researchers suggests that once machines achieve human-level intelligence and beyond, they might create something entirely unexpected: a ...

It may not breathe, eat, or sleep. It may not reproduce in any ordinary sense. It may not have a face, a voice, or a body shaped by evolution. It may be a machine. This is not a wild idea – it follows ...

Searching for extraterrestrial intelligence has so far primarily meant focusing on one particular type of signal—and that signal has normally been based on our own current cutting-edge technology. But ...

Letters: Readers offer their explanations for the absence of hard evidence for extraterrestrial civilisations, in response to an article by Adam Kirsch ...

If humanity ever makes contact with an intelligent extraterrestrial civilization, we will have no shortage of questions.

IN The shadows of Mount Shasta and Lassen Peak volcanoes in northern California, dozens of radio telescopes are gearing up to search for extraterrestrials. Thousands of kilometres away in Boston, ...