The Earth is not alone in this fickleness: The sun's magnetic shield appears to reverse its polarity approximately every 11 years. Even our Milky Way galaxy is magnetized, and experts say it ...

The Earth acts like a giant bar magnet, with a magnetic north and south pole ... In the last 100 million years, the poles have switched nearly 200 times, with the last switch happening ...

Would a dramatic change in the Earth's magnetic field affect creatures that ... had been around for 120 million years. How she lived solely on jellyfish, a thing more water balloon than animal.