This isn’t really an answerable question because what do you even count as “discovered”? That’s a subjective measurement.
Also, almost no satellites look at space. The overwhelming majority of satellites are used for Earth-based applications like communications or Earth observation. At any given time, there are only a dozen or so space telescopes in operation, and there have been maybe 100 or so *ever* since the spaceflight era started in 1957.
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