Carvings on a 12,000-year-old monument in Turkey appear to mark solar days and years, making it possibly the oldest solar ...

The Earth is really, really old. Over 4 1/2 billion years old, in fact. How do we begin to comprehend a number that large? It helps to put it on a more fathomable scale. Watch to see where Earth's ...

Researchers have made a new discovery that changes our understanding of Earth's early geological history, challenging beliefs ...

Earth Day has been celebrated across the country for more than 50 years now, and the annual celebration is once again around ...