According to an alternative model of how intelligent life emerges on planets like Earth, the existence of aliens—and human beings–could be the result of natural planetary processes.

Scientists challenge the idea that intelligent life is rare. They argue that evolution follows planetary changes, not random luck.

For decades, scientists assumed that life on Earth emerged through a chain of highly improbable flukes. But a new theory suggests it may have instead arrived just in time.

Intelligent life in the Universe could be far more widespread than previously imagined. A new study has just shaken up a well-known theory, the "hard steps" theory, by explaining that the