Two weeks ago CNN was talking about the Hubble upgrades. They showed the optical disc jukebox (or whatever subsystem is inside that thingie the size of half a room) that holds ALL the Hubble data. They must have some sort of super-sensitive CCD digicam capturing the short end of the telescope. It couldn't be film, because the Hubble doesn't have a nearby 1-hour photo processing center.
I think the guy said it was 70 terabytes of data. So far.
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