PARIS — The commercial arm of the Indian Space Research Organization (ISRO) charged about $28,500 per kilogram to launch 29 cubesats aboard its PSLV rocket on June 23, a price that appears to reflect a drop compared to previous missions.

There is no such thing as a “standard” price for launches, even for large geostationary-orbit telecommunications satellites, for which an average per-kilogram launch price can be instructive over time.

The problem is complicated in the case of cubesats, which are usually launched as piggyback customers on a . . .

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