Two months ago, scientists detected an unusual object entering our Solar System, sparking speculation about whether it is a ...

Sagan's team created the greatest puzzle of all time, which you can only solve if your species understands the basic nature ...

If intelligent alien civilizations exist, why has nobody ever contacted humanity? This video explores the famous Zoo Hypothesis, the Fermi Paradox, and the unsettling possibility that advanced ...

Running for over 50 years, the BBC's "Doctor Who" has had its share of iconic villains. But one of the most beloved baddies almost didn't make it into the show.