Re: A quote from Hawking
"how do we "park" the telescope when it reaches 550AU?"
We start decelerating it very very gradually as soon as it's past the half-way point. Not sure if practical but it might be possible to harvest a tiny amount of energy from the ambient radiation to do so. Even if infinitesimal amount of decelaration is possible, it's happening over the course of decades. And keep onboard fuel / nuclear reactor power for final braking and manuevering.