Does Man's Capacity to Ascend to the Moon Justify Changing the Traditional Nussach of Kiddush Levanah?
In the text of Kiddush Levanah we say: כשם שאני רוקד כנגדך ואיני יכול לנגוע בך - "Just as I dance before you and cannot touch you." Some have suggested since it is now possible to ascend to the moon we can no longer recite: ואיני יכול לנגוע בך "and cannot touch you" and the wording should be changed to: בשם שאני רוקד כנגדך ואיני נוגע בך "Just as I dance toward you but do not touch you", since in fact we are able to touch it. In truth, this wording appears in Maseches Sofrim (20:2), and there (according to the version of the Vilna Gaon) it says: ואיני נוגע בך - "and I do not touch you.” And in Maaseh Rav (ois 160) it is recorded that this is indeed the Gaon's version in Kiddush Levanah — he would say only: ואיני נוגע בך - “and I do not touch you."
Maran HaGaon Rav Chaim Kanievsky zt"l was asked (in Derech Sichah, pg. 619) to explain how we are able to say "I cannot touch you", if in fact we can? He answered two simple answers: 1) It is impossible to touch the entire moon. 2) The meaning is that as one stands down here on earth, he cannot touch the moon.
Perhaps we can offer another answer. There is a machlokes haposkim if one is allowed to travel to the moon. The Shu”t Mishneh Halachos (6:259) writes that it is forbidden to go up to the moon because it is a place of danger, and one may not place himself in danger. The very ascent is dangerous, and since there is no air there, remaining there is forbidden because it is dangerous.
If we take on that it is forbidden we can undertsand the nussach of Kiddush Levanah very simply, as although it is possible to go to the moon, it is forbidden and: ואיני יכול לנגוע בך we are not allowed to try and touch it.