Just do it in space and avoid the whole atmosphere and ground based light pollution. Space is cheaper than ever now, this is a problem for amateur astronomers, and hobbyists shouldn’t hold back progress.
Where is SpaceX offering to put up a billion dollars worth of space observatories to offset their pollution of a public good?
Instrument development has to first occur on earth-- including the research that lets us know which things will yield results deployed in space.
Astronomy aside, fleets of satellites once they turn to junk may eventually make further launching problematic.
On very rare occasions, a launch malfunctions in such a way that the satellites end up in unintended orbits that do turn into long-term junk, but this is not the norm.