Cassini & Huygens
When the Cassini-Huygens mission was launched on 15 October 1997, the entry probe Huygens was mounted on the side of the Cassini orbiter spacecraft, connected by a rotary plate. Huygens spent the seven-year journey to Saturn in 'sleep mode,' only waking every six months for three hours at a time to allow functional checks to be performed.
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