If all the compasses in the world started pointing south rather than north ... Such reversals in the Earth's magnetic field, they'd tell you, are, roughly speaking, as common as ice ages.

Explaining the science behind the northern lights, and why 2025 could bring more opportunities to see them. #ExtremeNature ...

NASA is tracking the South Atlantic Anomaly (SAA), an unusual phenomenon in Earth's magnetic field. This region, characterized by a weakened magnetic field, has drawn scientists' interest and concern.

The magnetic field is shown by lines with arrows that point from north to south. You can tell how old some coins are by testing them with a magnet. 5p and 10p coins made before January 2012 are ...