Planet Earth

A new model has predicted that Earth's population is likely to decrease in all scenarios across the next century and will peak nowhere near the 11 billion previously forecast.

A study of tomato and tobacco plants suggests they emit ultrasonic popping sounds when dehydrated or physically damaged.

A devastating, nearly mile-wide "wedge tornado" has killed at least 26 people and battered Mississippi with golf ball-size hail and winds up to 200 mph.

Heat waves are reaching the bottoms of Earth's oceans, and that could be a big problem for the creatures that live there.

Geologists have discovered the earliest evidence of a meteor collision with Earth: tiny fragments of melted rock that showered down on our planet 3.48 billion years ago.

Researchers from the British Antarctic Survey recently captured the first close-up video of A81, an enormous iceberg that broke off the Brunt Ice Shelf in January.

The UN's final IPCC report warns that drastic action must be taken immediately, but staving off disaster is within humanity's grasp.

A new model shows how the planet's surface evolved over the past 100 million years, from the shifting of tectonic plates to the movement of sediments.

Famous 'jellyfish' fossil from 300 million years ago was upside-down the whole time. It's actually another animal entirely.

Cyclone Freddy, which is finally dissipating after battering Southeast Africa, has crossed the entire Indian Ocean and made landfall three separate times.

In samples of organic-rich black shale, scientists found evidence for oxygen depletion and hydrogen sulfide expansion in ancient seas.

The bottom of the Mariana Trench is about 35,876 feet (10,935 meters) deep, making it deeper than Mount Everest is tall.

Here's a look at when the time changes for daylight saving time and who instituted daylight savings in the first place.

A relative of the tuberculosis bacterium has long been known to convert hydrogen from the air into electricity. Now, scientists have discovered how.

Antarctica's sea ice recently shrank to its lowest extent since satellite records began more than 40 years ago.

Physicists have finally uncovered the mechanism behind the spectacular patchwork of hexagons on salt flats. The answer lies hidden beneath the crust and works like a donut-shaped radiator.

Scientists calculated the diameter of Earth's innermost core using earthquake waves that bounced through the planet 'like ping-pong balls.'

You can't watch Earth spin in real time because it rotates so slowly, but there are ways to see the effects of the planet's rotation.