Here's why:
* Distance: The planets in our solar system are at vastly different distances from Earth. Even the closest planet, Venus, is much farther away than the Sun. The farther an object is, the smaller it appears to our eyes.
* Size: While some planets are quite large (like Jupiter), they are still significantly smaller than the Sun. This size difference is amplified by their greater distance.
Think of it like this: Imagine you're looking at a coin close up. It appears large. Now, imagine that same coin is a mile away. It would appear much smaller, even though its actual size hasn't changed.
The same principle applies to the planets and the Sun. The planets are very far away, making them appear tiny compared to the Sun, which is much closer.