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.
Who was the Anglo-Irish scientist who, in the 17th century, discovered that "the volume of a given mass of gas at a given temperature is inversely proportional to its pressure"?
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