It is well established Superman's flight is a feat of strength. It is an extension of his ability to leap tall buildings, an ability he derives from exposure to Earth's yellow sun

What does extension and exposure mean?

What it implies by "Earth's yellow sun"?

Question

It is well established Superman's flight is a feat of strength. It is an extension of his ability to leap tall buildings, an ability he derives from exposure to Earth's yellow sun

What does extension and exposure mean?

What it implies by "Earth's yellow sun"?

Answer

Here extension means additional abilities.

Answer

Well he is from a different planet called kryptonite hence the emphasis on the earth's yellow sun