Jupiter's Moon Europa Hides More Water Than All of Earth's Oceans Combined
Beneath Europa's frozen shell sloshes a salty ocean up to 150 km deep — kept liquid for billions of years and considered the best place to look for alien life.
Life & the Universe
The Universe Should Be Crawling With Aliens. So Where Is Everybody?
Billions of habitable planets, billions of years of time — yet total silence. The Fermi paradox is science's most unsettling unanswered question.
The 'Habitable Zone' Is Real — and Billions of Planets Sit Inside One
Around every star is a band where water can stay liquid. Our galaxy alone may hold billions of rocky planets orbiting inside this Goldilocks zone.
The Only Animal That Has Survived the Naked Vacuum of Space
In 2007, scientists exposed tardigrades to open space — vacuum, radiation, freezing cold. Many of them simply woke up and carried on living.