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 ...

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." ...

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.

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 ...

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

Rivers are shrinking and aquifers are falling, raising fears of “water bankruptcy” as billions experience increasing water shortages.

Some bacterial species possess an astonishing ability: They use Earth's magnetic field to orient themselves. To better ...