radioweather writes "What looked to casual observers like a malfunction, a dangling wire with something on the end, seen in the first photo of the meteorological mast on NASA's Phoenix Mars Lander, actually turned out to be the real instrument. Surprisingly, it is much like the novelty 'weather rock' seen as a novelty gag around the world. The instrument called the 'Telltale' is described as a 'passive wind indicator' and uses an extremely lightweight Kapton tube hanging in Kevlar fiber. Images taken of the instrument will show the deflection of the Telltale due to the Martian wind."
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