Scientists suggest the first alien signal we detect could be a desperate cry for help from a fading civilization.

In this scenario, our first contact with aliens would be tragic. We should look for "loud shouts in the night".

Harvard scientist Avi Loeb claims the interstellar object 3I/ATLAS may be alien technology sent to seed life on Earth, sparking a debate with sceptics who insist it is merely a comet.

Historically, many scientists and society have been fascinated by the prospect of making contact with extraterrestrial ...