[Jewbacca]

Or a swarm of them could assemble into a larger ship on arriving at their destination.

[LibWhacker]

Or these needle-sized ships would carry nano-assemblers that could use raw materials found at the destination site to build "a scientific station for analysis and data return."

'Course, I don't see how the heck they're going to accomplish all this in our lifetime (not mine, anyway) -- Maybe in the lifetimes of our grandkids...