Earth’s magnetic poles could start to flip. What happens then?

The magnetic field protecting our planet originates deep in the Earth's core but fluctuates in strength over time.

by Jonathan O’Callaghan As Earth’s magnetic shield fails, so do its satellites. First, our communications satellites in the highest orbits go down. Next, astronauts in low-Earth orbit can no longer phone home. And finally, cosmic rays start to bombard every human on Earth. This is a possibility that we may start to face not in … Read more