Why doesnt all of the suns energy make it to the earths surface?

Answer 1

-- Almost all of it misses the Earth, because the Earth is such a small target.

-- A substantial amount of the tiny fraction that does score a direct hit on

the Earth is absorbed by the atmosphere.

Answer 2

For the same reason that most of the water that comes out of a lawn sprinkler

never makes it to a single blade of grass.

The sun's energy radiates out from the sun in all directions ... up, down, and all around it.

The earth is in only one direction from the sun, and is tiny compared to it.

(Seen from the sun, the earth appears the same size as a dime coin looks to you

from about 700-ft away.)

So most of the sun's radiation goes off in other directions, and even if it starts out

in roughly the right direction, it completely misses the earth and just keeps going.