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"Let's look for spy satellites / orbiters" was an "application" I wondered about. My second thought about this was: maybe the US (and possibly other countries) already have something like this, but classified?


The US already has a very sophisticated system for this.

https://en.wikipedia.org/wiki/United_States_Space_Surveillan...


There is the Space Surveillance Telescope [1] in Australia. It is similar military telescope for space tracking. It is only 3.5m compared to LSST 8m.

1: https://en.wikipedia.org/wiki/Space_Surveillance_Telescope


note that lots of the lsst funding is from the DOE. part of the value for the government might be tracking Chinese satellites




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