What Is Saturn's Largest Moon Titan Like?
QUICK ANSWER
Titan is Saturn's largest moon and the second-largest moon in our solar system. It's the only moon with a thick atmosphere, has lakes and rivers of liquid methane on its surface, and may have a subsurface ocean of water. Titan is one of the most Earth-like worlds we've ever explored.
Titan is the strangest familiar place in the solar system. It has clouds, rain, rivers, and lakes, but the rain is liquid methane and the surface is freezing. Titan is also the only moon with a substantial atmosphere, which makes it look more like a planet than a moon when viewed from space.
How big is Titan?
Huge for a moon. According to NASA, Titan has a diameter of about 3,200 miles (5,150 km), making it bigger than the planet Mercury. Titan is the second-largest moon in our solar system, after Jupiter's Ganymede. It's larger than Earth's Moon by a substantial margin. Titan's size combined with its atmosphere makes it the only moon that would qualify as a planet if it orbited the Sun directly instead of orbiting Saturn. Titan accounts for about 96 percent of all the mass orbiting Saturn besides the planet itself.
Does Titan really have liquid lakes?
Yes, but not water. Titan has rivers, lakes, and seas of liquid methane and ethane, which stay liquid because Titan's surface temperature is about -290°F (-179°C), cold enough to keep these hydrocarbons in liquid form. The Cassini mission confirmed these lakes with radar imaging starting in 2006. Some of Titan's lakes are larger than the Great Lakes on Earth, with the largest, Kraken Mare, comparable in size to Earth's Caspian Sea. Methane rain falls from the sky, fills the lakes, and slowly evaporates, just like the water cycle on Earth but with completely different chemistry.
What is Titan's atmosphere like?
Thick, nitrogen-rich, and orange. Titan's atmosphere is about 95 percent nitrogen and 5 percent methane, with traces of other hydrocarbons. The atmospheric pressure at Titan's surface is about 1.45 times Earth's, making it the only moon with a denser atmosphere than ours. The atmosphere has a hazy orange color from complex organic molecules called tholins, which form when sunlight breaks apart methane high in the upper atmosphere. The thick atmosphere combined with low gravity means humans could theoretically fly on Titan by flapping arm-mounted wings.
Could there be life on Titan?
Possibly, though it would be unlike Earth life. Titan's surface is too cold for water-based life as we know it, but the abundance of organic chemistry has led some scientists to speculate about possible life forms using liquid methane as a solvent instead of water. Titan also has a likely subsurface ocean of liquid water (potentially mixed with ammonia) beneath its icy crust, which could host more familiar water-based life. NASA's Dragonfly mission, set to launch in 2028 and arrive at Titan in the 2030s, will explore the surface using a drone-like rotorcraft.
Titan is one of the most extraordinary places in our solar system: a moon with a thick atmosphere, lakes of liquid methane, methane rain, and possibly a subsurface water ocean. It's both deeply alien and oddly Earth-like, with weather, rivers, and lakes that work on completely different chemistry. The upcoming Dragonfly mission may help us understand whether Titan could host any form of life.
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