Mercury Planetary Orbiter high-gain antenna
Close-up of the Mercury Planetary Orbiter (MPO), showing the steerable one-metre-diameter dish of the high-gain antenna. The black protrusion on the edge to the right of the dish is one of the MPO's two low-gain antennas. The two small red squares underneath are sun sensors. A portion of the Mercury Magnetospheric Orbiter (MMO) can be seen at the top.
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