If two bar magnets are placed side by side with their north poles pointing in opposite directions, the magnets will

Alright, so magnetism is the idea that "opposites attract." If you were to place two bar magnets with both northern poles facing the same way, they're gonna repel each other, and push one another away. This is because they can't find the opposite end of the other. So if you put the north poles facing in the opposite directions, the northern sides will be attracted to the southern, and having found its match, that means they're gonna stick together.

The magnets themselves won't move at all, but they'll be heavily attracted to one another. Here's a photo of the magnetic fields to explain it a bit better.

the supermassive black hole is in the middle of the galaxy.