While armor is indeed much harder in space, it is not impossible:

https://en.wikipedia.org/wiki/Whipple_shield

Whipple shields use spaced plates to disperse the impact of a projectile on the first plate over a larger area on the second plate, and so on and so forth over four or five plates such that the final plate is not penetrated.

My father worked on high velocity impact ballistics and has some very nice multiple exposure results. The light gas guns used to propel the test cubes are just as interesting as the shields themselves.