SpaceX has sent humans to the top and bottom of the world for the first time. Aboard the spacecraft Resilience, four private ...

Bar magnets and horseshoe magnets are two of ... They will be pushed in opposite directions. If you bring a north pole and a south pole together, they will attract. Earth's core contains liquid ...

Alanna Mitchell: Right now on the surface of the planet, it looks like it's just a bar ... two-pole system. But sometimes, Earth doesn't always just have a single magnetic North and South Pole.