Satellite with the thickest atmosphere

Saturn's large moon Titan has the thickest atmosphere of any moon in the Solar System, exerting a surface pressure of 1.44 bar. It consists mainly of nitrogen gas and is the most similar atmosphere to our own in the Solar System.

At the surface of Titan, the atmospheric pressure is nearly 1.5 times that of the atmospheric pressure at the Earth's surface. Titan is the only moon in the Solar System to have a thick atmosphere - an orange smog layer completely obscures our view of its surface. The European Space Agency's Huygens probe made a soft landing on the surface of Titan on 14 January 2005, and took detailed measurements of Titan's atmosphere during its descent. The Huygens probe, which was lander around 1.3-m in diameter, reached Saturn as a secondary payload of the NASA/ESA Cassini spacecraft.