Humans have wiped out hundreds of species — with many more on the brink or experiencing large declines in population. Some scientists have argued that we have entered a “sixth mass extinction” event ...

Every 26 million years, something triggers mass extinctions on Earth - at least according to a fringe astronomical theory that refuses to die. Enter Nemesis, a hypothetical brown dwarf lurking 95,000 ...

Earth has a long and dramatic history, and one recurring theme is extinction. Did you know that over the last 500 million years, our planet experienced five major mass extinction events? These events ...

(CNN) — Humans have wiped out more than 100 species — with many more on the brink or experiencing large declines in population. Some scientists have argued that we have entered a “sixth mass ...

Prominent research studies have suggested that our planet is currently experiencing another mass extinction, based on extrapolating extinctions from the past 500 years into the future and the idea ...

One of the persistent claims made across the twentieth century is that humans are causing mass extinction of species, both in rate and numbers, unseen since the end of the age of dinosaurs. I ...

Add Yahoo as a preferred source to see more of our stories on Google. A skeleton of a Dodo. - Kirsty Wigglesworth/AP Humans have wiped out hundreds of species — with many more on the brink or ...

Add Yahoo as a preferred source to see more of our stories on Google. Brown dwarfs are stellar misfits — too massive to be planets, too lightweight for nuclear fusion. If Nemesis exists, it’s ...