During a brief but dramatic chapter in Earth's history about 41,000 years ago, the planet’s magnetic field nearly collapsed.

Scientists believe that the weak magnetic field let a lot of ... a two-billion-year-old rock suggested that the magnetic field was just as strong as it is now. Sign up for Chip Chick’s ...

Researchers say they may have achieved Einstein's vision of a "unified field theory" that can unite two of nature's ...

Many astronomers believe a strong magnetic field is a requirement for life. But events like the Laschamps excursion show that life on Earth endured even when the field was weak. Studying these ...