Imagine receiving an alert on your phone from a government agency at night, warning you about an alien attack, when you have ...

A hoax 'alien invasion' alert in Brazil caused panic and amusement, revealing vulnerabilities in emergency systems.

Residents of several cities in Brazil received notifications about an alien attack from the country's national civil defense.

Harvard scientist Avi Loeb, who thinks that the interstellar object racing towards the inner solar system could be an alien spaceship, has called on world leaders to come up with an action plan that ...