In school, we learned about the asteroid that wiped out an estimated 76% of all creatures. Scientists now call this the fifth ...

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 ...

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 ...

(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 ...

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 ...

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 ...