Say hello to “Scotty.” The towering and battle-scarred Tyrannosaurus rex is the biggest yet discovered and the largest terrestrial predator known to science.

Twilight is that magical time between daylight and darkness. Astronomers, the experts on nighttime, recognize 3 twilights.

For the first time, scientists made a successful in situ collection of bacteria living in hot springs in Yellowstone National Park and using an unconventional source – electricity – for food and energy.

Stay overnight on an Antarctic ice shelf, and you might feel the shaking from thousands of tiny quakes as the ice re-forms after melting during the day.

It’s said that once you’ve seen a green flash, you’ll never go wrong in matters of the heart. Here’s all you need to know to be able to see one, plus great pics!

It’ll help unlock mysteries about these iconic apex predators – explaining their “superpowers” like wound-healing and long lifespans – and why they’ve thrived more than 400 million years.

Earth’s atmosphere contains about 21% oxygen today. Plants produce it, and animals – including humans – breathe it. Ancient rocks provide clues about when the oxygen in Earth’s atmosphere began to arise.

Heightened volcanic activity in the Nevados de Chillán prompted Chilean authorities to issue an orange alert in anticipation of an eruption.