ocr: THE MOONS OF NEPTUNE OF NEPTUNE'S EIGHT MOONS, only Triton and Nereid were known of before Voyager. - 2 investigated Neptune in 1989. Triton is the coldest-known object in the Solar System, with a surface temperature of-235"C(391F)E is surrounded by a thin atmospnere of nitrogen. Wind-blown dust and nitrogen vapor DUSTY MAJOR MOON BLAST With a diameter of2,705 km Triton S surface is: streaked (1,680. miles), Triton is the with black dust spewed largest ofNeptune's moons. out, from geyser vents. Geyser ventl Streak of fallen dustl MOON FACT POSITIONS FILE
