The comet is now racing away from the sun following a close flyby on Jan. 20.

With an estimated 6 sextillion kilograms of the stuff—that’s 21 zeroes by the way—the Earth’s core is another example of why hydrogen is the most abundant element in the universe.

In the whole history of Earth's climate, few events are as extreme as those that geologists call "Snowball Earth." ...

It may become impossible to fix ...

New potential climate crisis just dropped.

The object is hurtling towards the Earth at a zippy 12,616 miles per hour, according to data from the space agency.

Tiny zircon crystals are revealing that Earth’s earliest history may have included surprisingly complex tectonic activity.

Gravity feels reliable—stable and consistent enough to count on. But reality is far stranger than our intuition. In truth, the strength of gravity varies over Earth's surface. And it is weakest ...

Astronomers have searched the skies for signs of extraterrestrial technology for decades. These searchers since 1960 have scanned the Milky Way for radio waves, optical flashes, infrared heat and ...