Today marks the 150 th anniversary of the discovery of Triton. He was attempting to confirm his observation, made just the previous week, that Neptune had a ring. But this time he discovered that Neptune had a satellite as well. Lassell soon proved the ring was product of his new telescope's distortion, but the satellite Triton remained. Voyager 2 found fascinating terrain , a thin atmosphere, and even evidence for ice volcanoes on this world of peculiar orbit and spin.
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