A 66 million-year-old mystery behind how our planet transformed from a tropical greenhouse to the ice-capped world of today has been unraveled by scientists. Their new study has revealed that Earth's massive drop in temperature after the dinosaurs went extinct could have been caused by a large decrease in calcium levels in the ocean.

A bullet-speed experiment reveals that the Earth's inner core may be softer and more dynamic than previously thought.

It was quite a leap. Conspiracy theorists are being brought back down to Earth after NASA scientists debunked a wild claim that the space agency was hiding knowledge about an event that could result in millions of deaths and injuries.

Our planet has experienced dramatic climate shifts throughout its history, oscillating between freezing "icehouse" periods and warm "greenhouse" states.

Aurora alert! The colossal solar storm could impact and trigger impressive northern lights.

Small but mighty, the red planet — our celestial neighbor — has made Earth’s climate what it is today. Mars’ gravitational pull serves as a stabilizing force for our home’s orbit, tilt and position from the sun. Without it, life could potentially have been a lot different from what we know today.

Carbon released from Earth's spreading tectonic plates, not volcanoes, may have triggered major transitions between ancient ice ages and warm climates, new research finds.

The CME was launched during a powerful X-class solar flare on Jan. 18 and raced toward Earth at speeds of 620–870 miles per second (1,000–1,400 km/s). Aurora chasers, get those camera batteries charged and your alerts switched on — tonight could be quite the night.