Voyager 1s mission included a flyby of Titan, Saturn's largest moon, which had long been known to have an atmosphere. Images taken by Pioneer 11 in 1979 had indicated the atmosphere was substantial and complex, further increasing interest. The Titan flyby occurred as the spacecraft entered the system to avoid any possibility of damage closer to Saturn compromising observations, and approached to within , passing behind Titan as seen from Earth and the Sun. Voyager's measurement of the atmosphere's effect on sunlight and Earth-based measurement of its effect on the probe's radio signal were used to determine the atmosphere's composition, density, and pressure. Titan's mass was also measured by observing its effect on the probe's trajectory. The thick haze prevented any visual observation of the surface, but the measurement of the atmosphere's composition, temperature, and pressure led to speculation that lakes of liquid hydrocarbons could exist on the surface.
Voyager 1s mission included a flyby of Titan Saturn's largest moon which had long been known to have an atmosphere Images taken by Pioneer 11 in 1979 had indicated the atmosphere was substantial and complex further increasing interest The Titan flyby occurred as the spacecraft entered the system to avoid any possibility of damage closer to Saturn compromising observations and approached to within  passing behind Titan as seen from Earth and the Sun Voyager's measurement of the atmosphere's effect on sunlight and Earth-based measurement of its effect on the probe's radio signal were used to determine the atmosphere's composition density and pressure Titan's mass was also measured by observing its effect on the probe's trajectory The thick haze prevented any visual observation of the surface but the measurement of the atmosphere's composition temperature and pressure led to speculation that lakes of liquid hydrocarbons could exist on the surface