Labels:text | screenshot 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 ℃ (-391 ºF ). It is surrounded by a thin atmosphere of nitrogen. Wind-blown dust and nitrogen vapor MAJOR MOON DUSTY BLAST With a diameter of 2,705 km Triton's surface is streaked (1,680 miles), Triton is the with black dust spewed largest of Neptune's moons. out from geyser vents. Geyser vent Streak of fallen dust MOON FACT POSITIONS FILE
