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 ...

This surprising hypothesis, published in Earth and Planetary Science Letters, stems from plate tectonic reconstructions for the Ordovician period noting the positions of 21 asteroid impact craters ...

And—according to a study recently published in the journal Earth and Planetary Science Letters—during an era known as the Ordovician period, it may have once had rings. Seriously.

All the latest science news about ordovician from Phys.org. ... One of Earth's most consequential bursts of biodiversity—a 30-million-year period of explosive evolutionary changes ...

From the Ordovician period to present day where we may be experiencing a sixth mass extinction, here are the mass extinctions that repeatedly wiped out life on Earth. By Gemma Tarlach. ... As Leakey ...

All the latest science news on ordovician period from Phys.org. Find the latest news, advancements, and breakthroughs.

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.

The End-Ordovician Extinction was the first of the so-called ‘Big Five’ mass extinctions in the history of life on Earth - more than 80% of species in the oceans died out. But could you ...

One of Earth's most consequential bursts of biodiversity—a 30-million-year period of explosive evolutionary changes spawning innumerable new species—may have the most modest of creatures to thank for ...