Beskrivning : NASA officials decided to move up part of the servicing mission that had been scheduled for June 2000 after three of the telescope`s six gyroscopes failed. Three gyroscopes must be working to meet the telescope`s very precise pointing requirements, and the telescope`s flight rules dictated that NASA consider a "call-up" mission before a fourth gyroscope failed.
Houston illustrated post stamp.

Sida : future · Ref: USA 2574 A

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STS 103 (DISCOVERY) · HUBBLE SPACE TELESCOPE · SERVICING MISSION #3A · CLERVOY & NICOLLIER (E.S.A.)