New Southwest Research Institute-led modeling indicates the main belt asteroid (52246) Donaldjohanson may have formed about 150 million years ago when a larger parent asteroid broke apart; its ...

The researchers' idea that Earth once had rings comes from reconstructions of Earth's plate tectonics from the Ordovician period—which ran between 485.4 million years and 443.8 million years ago ...

Earth may have sported a Saturn-like ring system 466 million years ago, after it captured and wrecked a passing asteroid, a new study suggests. The debris ring, which likely lasted tens of ...

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. … ...

Earth may have had a ring made up of a broken asteroid over 400 million years ago, a study finds. The Saturn-like feature could explain a climate shift at the time.

In a discovery that challenges our understanding of Earth's ancient history, researchers have found evidence suggesting that Earth may have had a ring system that formed around 466 million years ...

If you were to look up from Earth some 466 million years ago, you might have seen a gleaming ring stretching across the sky, some scientists say.

Anyone living on Earth between 720 million and 635 million years ago probably would've needed a jacket. Geologists have long suspected that Earth's temperature dropped dramatically during this ...

However, Earth’s magnetic field almost collapsed 591 million years ago, and this change, paradoxically, may have played a pivotal role in the blossoming of complex life, new research has found ...

An illustration of Earth's magnetic field, the Earth, the solar wind, the flow of particles. Research suggests the magnetic field nearly collapsed around 600 million years ago, and that may have ...