_Titan (also known as Saturn VI) is the largest moon of Saturn, the second lagerst moon of the solar system after Ganymede, and has captured the attention of scientists writers, and even script writers (see, e.g. Gattaca) because it is the only known satellite provided with an atmosphere.
The atmosphere is so dense, though, and opaque, that it causes the so called anti-greenhouse effect: this effect is only seen on Titan so far and it basically menas that the atmosphere cools the surface of the satellite (contrary to what happens on earth! That’s called Greenhouse effect and is more comon). _
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