It was ground perfectly here on earth. But when they put it in 0 gees it warped because gravity was not holding it down.
I had not heard that, interesting. I was under the impression it left the factory floor as a spherical mirror, not parabolic. If that is indeed the case then it is a little more understandable.
Neat stuff about planet discovery though! That's great news!
Anybody know if there's any truth to the rumour that there is a second Hubble that points
down? (...could see the hair on a flea's butt!)