Simple Maths, but tough to relate to this fact considering that the thickness of an average paper sheet is 0.01 cm and distance of moon from earth is 384,000 kilometers!.
Here is the proof:
Let the thickness of paper be x
On every fold ,the thickness of resulting paper will be 2 times
Therefore for 42 folds thickness becomes (2^42) times x
Assuming x to be 0.01 cm , (2^42) times x becomes roughly 439,804 km. And distance of moon from earth is 384,000 km.