To assess the plausibility of alien visitors, it’s necessary to understand the obstacles that an extraterrestrial vessel would need to overcome to reach Earth ...

The universe is vast and teeming with stars – but if intelligent life exists, it may not be able to visit Earth.

Aliens could already be broadcasting clear signals across the cosmos while humans remain 'utterly blind' to them, according ...

Barack Obama's insisting the USA doesn't have little green men or alien spaceships locked up in an underground bunker somewhere ... but, if they ever visit Earth, he's volunteering to lead the ...