As amazing as Hubble is, it's worth remembering that other agencies built several more devices of the same or better resolving capability, and the NRO donated t

As amazing as Hubble is, it's worth remembering that other agencies built several more devices of the same or better resolving capability, and the NRO donated two spares to NASA almost a decade ago [1][2]. Not sure what's happened with those devices since then. "Why build one when you can have three, at thrice the price?" [1] http://content.time.com/time/health/article/0,8599,2116436,00.html http://content.time.com/time/health/article/0,8599,2116436,0... [2] https://www.spacesafetymagazine.com/space-exploration/deep-space/nasa-hold-workshop-determine-donated-nro-telescopes/ https://www.spacesafetymagazine.com/space-exploration/deep-s...