There have been hundreds of unexplained UFO sightings in history, while most remained classified and brushed under the rug. Today, we're going to look at a few of the most famous alien encounters that ...

Do aliens exist? Few debates have proved as enduring – or as divisive – as the question of whether there is life beyond Earth ...

At the keynote panel at SXSW, Steven Spielberg revealed his beliefs that "we are not alone here on Earth right now." ...