New research suggests the violent explosions of dying stars may have caused two of Earth’s biggest mass extinctions millions ...

Two of Earth’s five confirmed mass extinction events could have been caused by nearby supernova explosions stripping the ...

Ordovician reefs were also home to large sea ... are more closely related to spiders and scorpions. A few species of these "living fossils" still survive today, such as along the eastern seaboard ...

Two nearby explosive massive star deaths, or supernovas, may have triggered mass extinction events in Earth's distant past, new research suggests.

Specifically, the findings support the hypothesis that supernovae could have triggered two of the so-called "big five" mass ...

Sharks have been around for hundreds of millions of years, appearing in the fossil record before trees even existed. But what did they evolve from, are they 'living fossils', and how did they survive ...

A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

Some species grew to more than six feet (two meters ... positioned over the South Pole but the vast icecaps of the late Ordovician period melted almost to nothing. Sediments formed from massive ...

Scientists have been searching for the species since it disappeared in 1933. Researchers have rediscovered a rare fish species presumed to be extinct after it was not seen for more than eight decades.