A history of the movement by EarthDay.org, where Hayes remains board chair emeritus, says the date of the first Earth Day — ...

From the moon's formation to the Earth's core, some of the planet's biggest mysteries are still wide open Fascinating ...

Fifty-six years after the first one rallied 20 million people across America, “we need to do things that make us feel more ...

Earth Day is April 22. Here's what to know about how Earth Day happened and how to celebrate our planet this April.

How much do you know about our planet? Here are the amazing, odd and downright cool Earth facts scientists learned in the ...

Add Yahoo as a preferred source to see more of our stories on Google. You may have heard a lot of online chatter about Earth's two moons recently, but that doesn't quite get the discovery right. Earth ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. New research shows that rising sea levels caused by melting ice sheets are redistributing mass across the planet, ...

The Earth is pretty good at keeping its pace. However, variations do happen. And on three separate days this summer—July 9, July 22, and August 5—the Earth will spin notably faster than usual. Of ...

Pollen grains are far more than allergens — they are also nature’s time capsules, preserving clues about Earth’s past environments for millions of years. Pollen’s tough outer shell enables it to ...

Astronomers recently detected a stray quasi-moon in our planet’s orbit, but it's hardly the first stowaway to hang out around Earth. Unlike the Earth's moon, quasi-moons are not gravitationally bound ...

NASA says of Apophis passing by that it is likely "an event like this has not happened at any time in recorded human history.

You may have heard a lot of online chatter about Earth's two moons recently, but that doesn't quite get the discovery right. Earth still only has one true natural satellite — our 2,159-mile-wide moon ...