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The decision to abort was made a just few minutes from the start of the launch window, which opened at 0303 PDT. "Today's attempt to launch the CALIPSO and CloudSat satellites has been scrubbed due to loss of vital communications between the CALIPSO spacecraft and a monitoring link in France," said NASA in a statement. CALIPSO was developed by collaboration between NASA and the French space agency, CNES.
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Astronomers will soon be treated to a close-up celestial show, with a fragmenting comet streaming across the sky in more than 30 chunks. Comet 73P/Schwassmann-Wachmann 3 has been breaking up since 1995, but between 12 and 14 May will come closer to the Earth than any comet since 1983. Fortunately no threat is posed to Earth since, even at its closest, the nearest of the pieces will be twenty times more distant than the Moon.