Hi. I am writing a scifi story that involves some (i hope) realistic science. The conceit is to show, in the near future, some use of cheap "ballistic" probes of the inner system and eventually TNS and heliopause. They would be small objects launched in large numbers, designed to gather very specific data and perhaps to work together somehow. I am thinking they would be launched directly from the surface, perhaps via a magnetic chute. Am i on the right track? Is something like this plausible? What would be the physical properties of the probes? What kind of construction would a launcher have?