Earth's magnetic field dramatically flipped a little more than 40,000 years ago. We can now experience this epic upheaval, ...

A perfectly preserved ancient tree fossil offered scientists an unprecedented view into a moment 42,000 years ago when the ...

A NASA satellite that suddenly reappeared after going silent gets credit for the remarkable discovery—a pair of temporary ...

Learn how forces deep underground generate a protective bubble between us and space.

Recent research suggested this dense center reversed its ... affect life on Earth. Over time, changes to this innermost layer could impact the planet’s magnetic field, which shields our world ...