Baryon asymmetry

Have you ever played with magnets, and noticed how some magnets attract and some magnets repel? Scientists have found that certain subatomic particles called baryons, which are like little building blocks for everything in the universe, also have this kind of attraction or repulsion.

Now, sometimes in science, we have a symmetry - which means that things are the same no matter how you look at them. But scientists have noticed that there is a lack of symmetry between baryons and anti-baryons. Anti-baryons are like the opposite of baryons, kind of like how north is the opposite of south. And, there seem to be more baryons than anti-baryons in the universe.

This lack of symmetry is what we call the baryon asymmetry. Scientists are trying to figure out how and why this asymmetry happened, because it can help us better understand how the universe was formed and how it works today.