Just about a year ago, SpaceX sent the rocketry equivalent of a clown car to space: A rocket crowded with more than 60 small satellites. Inside one of them, Excite, were even more. It was actually a satellite made of other satellites, all clones of each other, all capable of joining together and working together. It was one of the first in-space tests of such a contraption—but in the coming years, this modular approach is likely to show up on more and more missions.

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