A NASA scientist is warning that Earth currently has no reliable way to stop thousands of so-called “city-killing” asteroids that could one day strike the pla ...

New potential climate crisis just dropped.

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." ...

As much as 45 oceans’ worth of hydrogen may be in Earth’s core, scientists reported, suggesting most of Earth’s water was ...

"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

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 ...

NASA estimates that roughly 25,000 near-Earth asteroids measuring at least 140 meters across orbit in our planetary neighborhood, but surveys have so far cataloged only about 40% of them. That gap ...