What is the atmosphere of Titan composed of?

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Titan’s atmosphere is similar to Earth’s both in the predominance of nitrogen gas and in surface pressure, which is about 1.5 bars, or 50 percent higher than sea-level pressure on Earth. However, its atmosphere is much colder, having a temperature at the surface of 94 kelvins (−290 °F, −179 °C), and it contains no free oxygen.