A sheet of paper is about 0.1 mm thick. Fold it in half and the stack is twice as thick. Fold again: twice as thick again.

Try it: type your guess first, then fold.

Only 42 folds: 0.1 mm × 2⁴² ≈ 440,000 km — past the Moon, 384,400 km away. (Real paper can only be folded a handful of times; this is a thought experiment.)

Doubling doesn't add the same amount each time. It adds everything you already have.