Elon Musk wants to send humans to the red planet. But even our robotic presence there risks contaminating Mars with invasive microbes.
An animal-welfare organization reflects on its nerve-wracking rescue—and what it might means for hundreds of other troubled zoos around the world.
Hubble shows signs that the moon is spitting water from a subsurface ocean, raising excitement for a planned mission to the frozen world.
Scientists are dismissing a new study suggesting Earth could already be doomed to warming of as much as 13 degrees Fahrenheit.
These ancient skeletons have a few things in common: scientific significance, fantastic discovery stories, and exquisite timing.
Animal News From National Geographic