December 15, 2003
The Earth’s protective magnetic field has fallen about 10 percent since 1845 and if that continues, the field could flip.
These flips happen every 200,000 years, on average, scientists say. The last one was 780,000 years ago.
Whether the field flips or merely continues to weaken, more harmful particles would flow in from the sun, resulting in an estimated extra 100,000 cancer cases a year; and solar particles… read more