Word: solarsystem
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Dates: during 1960-1969
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Some 2,600 miles in diameter, Triton orbits Neptune at a distance of 220,000 miles, about the same distance as the moon is from the earth. But unlike the earth's moon and most other solarsystem satellites, Triton moves in a retrograde direction: it circles the "wrong" way-clockwise-around Neptune which spins counterclockwise on its axis. Nereid, only about 200 miles in diameter, revolves in the direction of Neptune's spin, but its orbital path is highly irregular, swinging as far as 6,000,000 miles into space and as close as 900,000 miles from...
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