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Triton, largest of Neptune’s moons, whose unusual orbital characteristics suggest that it formed elsewhere in the solar system and was later captured by Neptune. Triton is unique among the large moons of the solar system in that it moves in a retrograde
of infrared radiation with that of radiation at visual wavelengths, investigators are able to derive the diameter of the asteroid. Other remote-sensing techniques—for example, polarimetry, radar, and adaptive optics (techniques for minimizing the distorting effects of Earth’s atmosphere)—also are ...