Living organisms share an ancestor called the last universal common ancestor, or LUCA. LUCA is estimated to have lived approximately four billion years ago. All plants, animals, and microbes can trace ...

More than 250 million years ago, life on Earth faced its most devastating crisis — a global event so severe that it wiped out nearly three-quarters of life on land and an even larger share in the ...

Over 15 years of fossil excavations in Tanzania and Zambia have revealed a vivid portrait of life before Earth s most devastating mass extinction 252 million years ago. Led by the University of ...

Grab-and-go missions to asteroids have provided some of the most scientifically valuable samples since the Apollo missions—and they’re shaking up the search for life beyond Earth. The OSIRIS-REx ...

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How did life begin on Earth? While scientists have theories, they don’t yet fully understand the precise chemical steps that led to biology, or when the first primitive life forms appeared. But what ...