"This has been a decade-long detective story, with each recorded meteorite fall providing a new clue," said one astronomer.

Following is a transcript of the video. Early in the history of our solar system, something mysteriously knocked Earth slightly off its axis. So today we tilt at 23.5 degrees. But what would ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth." ...

That's how quickly Earth rotates on its axis, from West to East. And that rotation is largely responsible for the distribution of every desert, forest, and swamp on the planet. So, let's do a ...

COLUMBIA, S.C. — As the year unfolds, we experience the distinct changes in weather that mark the passage of time: the freshness of Spring, the warmth of Summer, the crispness of Autumn, and the ...