and by whom?
Christiaan Huygens
Titan (moon)
Discovered in 1655 by the Dutch astronomer Christiaan Huygens
where is titan located in the solar system Titan orbits Saturn when was this moon discovered? 1655
wiki:11549060
Titan (moon) [SEP] Introduction
Discovered in 1655 by the Dutch astronomer Christiaan Huygens, Titan was the first known moon of Saturn, and the sixth known planetary satellite (after Earth's moon and the four Galilean moons of Jupiter). Titan orbits Saturn at 20 Saturn radii. From Titan's surface, Saturn subtends an arc of 5.09 degrees and would appear 11.4 times larger in the sky than the Moon from Earth. Titan is primarily composed of ice and rocky material, which is likely differentiated into a rocky core surrounded by various layers of ice, including a crust of ice I and a subsurface layer of ammonia-rich liquid water.