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Hubble glitch delays shuttle trip
the atlantis flight is complicated because it cannot gets to the safety of the space station from hubble's orbit if something goes wrong .
the new instruments will improve significantly hubble's ability to probe distant, faint objects in the early universe .
the atlantis astronauts must also repaire two instruments that have failed in recent years - the advanced camera fory surveys acs) and the space telescope imaging spectrograph (stis) .
thescue have started to fail and all will have to be replaced .
rescue readiness however, nasa says that even if hubble returns to science the space telescoperations very quickly, mission planners must now consider flying a back-up unit on the atlantis flight .
nonethelessfully, the preparation work platfor the transition is going ahead and engineers believe they will be in a position to reconfigure hubble later thing goes week .