Aliens have long been a staple of science fiction. Yet the possibility of intelligent life beyond Earth is more than a matter of imagination—it is also a subject of serious scientific inquiry.

Could ancient alien technology be hiding on the Moon? Scientists propose searching lunar dust for microscopic traces of ...

J.J. McCullough examines the Apollo 11 lunar plaques and the silicon disk that carries messages from 73 countries. He ...

Are there intelligent life forms in the universe other than on Earth?When thinking about this question, I am reminded of the science fiction novel 'The Three-Body Problem' by the Chinese author Liu ...

Most of our experience with the Search for Extraterrestrial Intelligence (SETI) has focused on capturing radio signals that alien species have sent out, whether intentionally or unintentionally. That ...

To date, the search for alien intelligence, collectively known as SETI, has focused on more human-esque types of searches. These include radio signals, laser pulses or even physical megastructures ...