This is an artist's drawing of the process that creates alternating magnetic bands in the crust of a planet. The red in the picture is north and blue is south.
Click on image for full size
Courtesy of NASA
Scientists Have Found Ancient Mars to be Like Earth
News story originally written on May 10, 1999
Scientists have found that ancient Mars was similar to Earth! Magnetic field lines flow from the north pole to the south, but sometimes they
switch. When scientists look at the lines, they can see how the planet has
changed over time. Pretty cool!
Do you want to know how Earth has changed?
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