The Earth: a ringed planet, much like Saturn, surrounded by a hula hoop of asteroids. The summit of Mount Everest: a tropical ...

“Over millions of years, material from this ring gradually fell to Earth, creating the spike in meteorite impacts observed in ...

The world and its ecosystems have been around for a long time — so long that the first mass extinction occurred “just shy” of ...

“This mass extinction event in the Ordovician, this happened hundreds ... “It was something around 85 percent of all life went extinct. So, it’s the second largest mass extinction event.” ...

This was the Ordovician-Silurian extinction ... And now, there’s a new threat to human existence and many other forms of life here on Earth. Climate change. Temperatures and sea levels are rising ...

Taken as a whole, the deposits are finegrained, and bear evidence of having been laid down in dear sea water ... of radiolarian cherts, both of Ordovician and Carboniferous ages, has been made ...

Let’s start with a clear definition of what constitutes a mass extinction. Unlike regular extinctions, which occur at a steady background rate — about 10% of species lost every million years — mass ...

This era of intense bombardment, known as the Ordovician impact spike, may have resulted from meteorites falling from the ring rather than flying in from space, which would explain the strange ...

with a steep rise occurring during the Ordovician period. Back then, the world would have looked much different than it does today. Sparse patches of green slime or moss-like species may have spread ...

Earth might have had a ring system in the past, similar to those of Saturn. Scientists drew these conclusions based on the ...