If humans ever receive a message from intelligent aliens, the biggest challenge may not be how far away they are, but how to communicate at all. Our nearest star system is more than four light-years ...

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 ...

Advanced alien civilizations may communicate via a series of flashing lights, similar to how fireflies do, a new paper hints. This would potentially make extraterrestrials much harder to spot if we ...

For generations, people along Alaska's coast reported a strange sound carrying over the water. Some compared it to distant thunder or machinery. Others felt it vibrate through buildings. Researchers ...