Final answer:
The most abundant gas in Titan's atmosphere is nitrogen, also featuring hydrocarbons like methane, and multiple layers of hydrocarbon haze that contribute to its orange coloration.
Step-by-step explanation:
The most abundant gas in Titan's atmosphere is nitrogen. Titan, which is a moon of Saturn, has a significant atmosphere in contrast with other moons in the outer solar system. Its atmosphere primarily consists of nitrogen, similar to Earth's, but unlike Earth, it does not contain free oxygen.
The composition of Titan's atmosphere also includes hydrocarbons such as methane (CH4), ethane (C2H6), and propane (C3H8), as well as nitrogen compounds like hydrogen cyanide (HCN), cyanogen (C2N2), and cyanoacetylene (HC3N). These substances interact with sunlight, creating a complex tapestry of organic molecules through photochemistry.
Titan's atmosphere also features multiple layers of hydrocarbon haze and clouds, lending the moon its distinctive orange hue.