A day on Earth was just 23.5 hours long, 70 million years ago. Researchers discovered this by studying the growth rings of ancient mollusk fossils. The findings could tell us more about or planet ...

Interactions between Earth and the solar system have profoundly shaped the planet’s history, influencing evolution and climate. One striking example is the asteroid impact 66 million years ago ...

Dinosaurs are the extinct relatives of birds that roamed the lands and seas of ancient Earth. They first appeared around 240 ...

making it especially challenging to detect a signal from an event that occurred 14 million years ago. "The challenges in peering far back into the history of the Earth's climate clearly limit our ...

During the past billion years, the Earth's climate has fluctuated between ... For the Cenozoic period, which began about 70 million years ago and continues today, evidence derived from marine ...

Massive beds of ancient lava found around the world depict an Earth 65 to 70 million years ago where volcanic eruptions were commonplace. According to the volcanism hypothesis, this global-scale ...

A crater at the edge of the Yucatán peninsula in Mexico was created by a massive asteroid that hit Earth 66 million years ago At the end of the Cretaceous Period 66 million years ago, an ...

About 800 million years ago, oxygen levels reached about 21 percent and began to breathe life into more complex organisms. The oxygen-rich ozone layer was also established, shielding the Earth's ...