Meteņi are like little shooting stars that you can see in the sky. They happen because of something called a meteor shower. Imagine that the sky is like a huge blanket and there are lots of little rocks and dust floating around in space. When the Earth moves through this space blanket, the rocks and dust rub against the Earth's atmosphere and create a bright trail of light that we can see from down here.
So, meteņi are like little pieces of rocks and dust that light up and shoot across the sky. They happen when the Earth passes through a bunch of rocks and dust in space, and they are super fun to see! People like to watch them because they're amazing and beautiful to look at. It's like watching little fireworks in the sky!