In reply to graeme jackson:
Can I sneak a question in here, as we may get the odd astronomer looking in:
When the James Webb telescope is launched would it be possible to use the JWT and the HST for some optical very long base line interferometery.
I dimly recall from my A level physics (Im a biologist by trade) that resolution is related to the distance between teh two (or more) receivers so we ought to get better images.
I presume this is not really a starter or someone would have thought of this already.