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 ...

Instead, it was the result of a near-impact with a very large asteroid 466 million years ago. The asteroid passed so close to Earth that its gravity caused it to disintegrate, leaving its debris ...

Earth and the moon were bombarded by an asteroid shower 800 million years ago larger than the asteroid responsible for the extinction of the dinosaurs, according to a new study. It may have ...

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.

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 ...

Around 717 million years ago, the Earth froze over and became a giant snowball for at least five million years. In a new study, Harvard scientists suggest that the answer to this mystery might lie ...

The hothouse Earth at the end of the Triassic was most likely to be caused by supermassive volcanic eruptions, say our readers, ... Earth was a hothouse 201 million years ago, ...

Any impact craters to Earth prior to 600 million years ago, researchers believe, have been erased. That's why the moon, which is largely unchanged by erosion and weathering, ...