
Jüri Kaljundi added this comment to Esther's photo: "Basically there used to be 6 TDRS (tracking and data relay) satellites which can provide "no rest period" communication between the spacecraft and customer (or NASA). Out of the 6 only half should be operational online at any time, while 3 are in backup mode. ISS is one of many customers of the system. TDRSS 2 was destroyed in Challenger accident so satellite no 7 was built. Now I believe generation 2 of TDRSS is operational with 3 additional satellites. "
See Esthr's blog posting for more information.
Nice graphic representation of TDRSS
Wikipedia entries for
TDRSS
TDRS
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