A "bus-sized" asteroid being tracked by NASA will zoom safely past the Earth on Wednesday as both ... Do you have a tip on a ...

To put it bluntly, we know more about the curvature of Earth than almost any other topic in the realm of physical science. There are so many experiments, observations and demonstrations that have ...

Earth surface is covered with rigid plates that move, crash into each other and dive into the planet's interior. But when did ...

At the end of the last global ice age, the deep-frozen Earth reached a built-in limit of climate change and thawed into a ...

Bolivia’s Quebrada Honda Basin reveals ancient climate clues from 13 million years ago, offering insights for today’s climate challenges.

If Earth's history were a calendar year, humans would not appear until the last few minutes before midnight on Dec. 31.

For the believers and nonbelievers, the Pentagon answered whether UFOs or aliens have ever visited Earth ... fielded several questions from reporters on Thursday on topics such as the death ...

Old or new, sedimentary or igneous, some of the Earth's crust drifts below the surface at subduction zones, where one continental plate overlaps another. When it does, some of it melts, eventually ...