Horizon effect

When you stand outside and look at the world around you, there is a line where the sky seems to meet the ground. This line is called the horizon. The horizon effect is what happens when you can't see anything beyond that line on the ground because it's too far away or too low for you to see.

Imagine if you were playing with toy cars on a big, flat field. At first, you can see all the cars because they're close to you. But as you start to walk away, the cars get smaller and smaller until they're just specks on the ground - this is the horizon effect.

It's like when you're at the beach and you're looking out at the ocean. You can't see the other side of the ocean because it's too far away and the Earth is round. But if you go in a boat and sail far enough, you might be able to see the other side.

The horizon effect can also happen in space. When astronauts look at Earth from space, they can't see everything because the curvature of the Earth blocks their view. But they can see a little bit farther than we can on the ground because they're higher up.

Overall, the horizon effect is what happens when things are too far away or too low for us to see from our point of view.