Here's why:

* Immense Distance: The Sun is about 93 million miles (150 million kilometers) away from Earth. That's a *huge* distance.

* Perspective: The vast distance makes the Sun appear tiny in our sky, even though it's incredibly large. Imagine a basketball on the moon - it would appear as a tiny dot to someone on Earth.

* Relative Size: While the Sun is much larger than Earth, the difference in size is less significant when you consider the immense distance between them.

Think of it this way: If you were holding a tiny marble and a basketball, they would look quite different in size. But if you moved the basketball a mile away, it would appear much smaller than the marble you're holding. The same concept applies to the Sun and Earth.