Scientists define a mass extinction as around three-quarters of all species dying out over a short geological time, which is anything less than 2.8 million years, according to The Conversation ...

The Earth's 'Sixth Extinction' May Be One Of Our Own ... Scientists are currently monitoring an era of mass extinction ... Or if they're a marine organism, cross land. That now happens all ...

Earth as oxygenator. Earth loses about 90 tons of gas—mainly hydrogen and helium—to space every day. That’s tiny compared to the mass of our atmosphere, so there’s no cause for alarm. But ...

At least five times, a biological catastrophe has engulfed Earth killing off the vast majority of species. As scientists say we’re in a sixth mass extinction, what can we learn from the past?

Around 252 million years ago, Earth was nearly lifeless, with nearly all life forms wiped out. This event, known as the ...

The worst came a little over 250 million years ago — before dinosaurs walked the earth — in an episode called the Permian-Triassic Mass Extinction, or the Great Dying, when 90% of life in the ...

The Cretaceous-Paleogene extinction event is the most recent mass extinction and the only one definitively connected to a major asteroid impact. Some 76 percent of all species on the planet ...

Long before T. rex, the Earth was dominated by super-carnivores stranger and more terrifying than anything dreamed up by ...

About 66 million years ago, one well-known extinction killed off the dinosaurs, along with three out of four species on Earth. About 252 million years ago, the "Great Dying" snuffed out about 90% ...

All life on Earth, in one staggering chart. Scientists estimated the mass of all life. It’s mind boggling.

The biggest mass cataclysm of all time, called the end-Permian extinction, occurred 252 million years ago. Some 95% of species disappeared on land and at sea as a result of global warming — with ...

The defunct satellite's itinerary for returning to Earth was pretty up-in-the-air: The European Space Agency said it made maneuvers that would bring it back into Earth's atmosphere sometime within ...