Here's why:
* Angular Size: The apparent size of an object is determined by its *angular size*, which is the angle it subtends at the viewer's eye.
* Distance: As an object gets closer, the angle it subtends increases, making it appear larger. This is the same reason why objects look smaller when they are far away.
Think of it like this: hold your finger at arm's length and look at it. Now slowly bring your finger closer to your face. You'll notice your finger appears much larger as it gets closer. The same principle applies to celestial objects.
