The Student Dust Counter (SDC) will count and measure the sizes of dust particles along New Horizons' entire trajectory, which covers regions of interplanetary space never before sampled.
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Another set of 4 hydrazine thrusters for pointing, course corrections and KBO targeting.
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REX is an acronym for "radio experiment," - it is a small printed circuit board, containing sophisticated electronics, integrated into the New Horizons radio telecommunications system.
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