Harrison Ford -- I Shaved My Head!

It survived an intergallactic power struggle ... a mid-flight terrorist attack ... and a nuclear explosion (thanks to a fridge) ... but now, Harrison Ford's legendary hair HAS BEEN DESTROYED!

Ford was rollin' through LAX with his wife Calista Flockhart and their son this weekend ... when we noticed, the 70-year-old actor had totally shaved his melon.

We're guessin' Ford's newer, buzzier haircut is for a movie role ... though it's unclear which one.

Still ... the bald look works.

Take THAT, Wes Welker.