Are we alone in this universe? Is there intelligent life out there? Or are they living among us? Humans have wondered about ...

Mars has never looked more like a planet built for hiding secrets. A cluster of eight vast, water-carved caves appears almost engineered to shield fragile chemistry, or even biology, from the brutal ...

In a great year for premium TV, the standout theme was the re-emergence of the science fiction genre with shows that were ...

Rogue planets — worlds that drift through space alone without a star — largely remain a mystery to scientists. Now, ...

Young Earth was a blue planet covered in oceans, much like today. But the atmosphere was a lethal cocktail of gases, with no ...