The Earth’s magnetic field protects life on Earth, shielding it from damaging radiation and moderating our climate. So the idea that it could completely flip around, or collapse altogether, should cause us to worry, right? Well, yes and no.
Around 3.26 billion years ago — long before the dinosaurs — a massive asteroid measuring nearly 36 miles (58 km) across smashed into the Earth. Geologists have now reconstructed this cataclysmic event, and it was far, far bigger than we thought. Here’s how things went down on that fateful day.
Everyone knows that Yellowstone is home to a super-volcano
Gravity’s often assumed to be constant across the entire planet, but because the Earth varies in shape and density, that’s not really the case. Now, this super-accurate gravity map reveals that the fluctuations are even more extreme than scientists previously thought.