From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

Elon Musk doesn't believe aliens have visited planet Earth and thinks UFOs have more to do with the United States government ...

From orbit high above Mars, a familiar shape has appeared in an utterly alien landscape: a vast feature that looks uncannily like a butterfly pressed into the planet’s dusty crust. Captured by NASA’s ...

The man who has staked his reputation—and billions of pounds—on turning humanity into an interplanetary species has a ...