Why do sunbeams diverge even though the sun is much more than a few kilometers away?

Sunbeams spread out because the sun is really far away, even though it’s huge.

Imagine you're holding a flashlight in your hand. When you point it at the wall across the room, the light beam stays pretty narrow. But if you shine that same flashlight from the top of a mountain all the way to the bottom of another mountain, which is super far away, the light beam would look much wider by the time it gets there.

That’s exactly what happens with the sun. It's so far away (about 93 million miles!), that even though it's big, its rays come in like they're coming from a tiny point when they reach us. So those sunbeams spread out as they travel, just like your flashlight beam spreads out over a long distance.

Think of the sun as a giant flashlight up in the sky. When it shines down to Earth, its light has to travel all that way, and on its journey, it fans out. That’s why we see sunbeams, they’re like the light from a faraway flashlight spreading out before it hits the ground or our eyes.

So even though the sun is huge, it's also very far away, which makes the beams look like they're coming from many different directions, and that’s why they diverge!