Science
Image: Julie Mansy; Rory Cottrell; John Tarduno/University of Rochester
Earth’s earliest lands, hot and hellish, were sheltered from above. Researchers have found more evidence that our planet had a strong magnetic field 4.2 billion years ago, three-quarters of a billion years earlier than previously thought and just 350 million years after Earth formed. The field would have shielded Earth, protecting its atmosphere from being stripped away by high-energy particles from the Sun—and perhaps helping life gain a foothold. Read more on the Science magazine website…
