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发表于 2004-1-5 02:42:00
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“勇气号”登陆火星后传回第一组照片
Around 6:45 pm PST, the mission team will be preparing the spacecraft for communications during entry, descent, and landing. Spirit’’s cruise stage switches from its medium-gain antenna (which requires pointing toward Earth), to its low-gain antenna, which does not need to be pointed as precisely for the Deep Space Network antennas to pick up the signal. This switch slows the rate of data transmission, but is necessary to allow communications to continue when the spacecraft changes its orientation to point its heat shield forward.
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