Titan: Saturn's Moon of Methane Rain and Seas

The most Earthlike world we know is also one of the coldest.

Saturn's largest moon has clouds, rain, rivers, lakes and seas, all made of liquid methane and ethane. Under its orange haze and icy crust, spacecraft data suggest an ocean of salty water.

Updated 14 October 2026 · 4 sources

A thick atmosphere
Methane rain and seas
A hidden water ocean
Earthlike, at a deep freeze

Compare with Earth

THE SHORT ANSWER

An Earthlike world,
made of different stuff.

Titan has weather, rivers and seas.
The ingredients are just strange to us.

ATMOSPHERE

The only moon with real air

Titan's atmosphere is about 95% nitrogen and 5% methane. Sunlight breaks the methane apart, making an orange smog that hides the surface from ordinary cameras.

See the numbers

LIQUIDS

Seas of natural gas

It is the only place besides Earth known to have liquids on its surface: methane and ethane fall as rain, carve rivers and fill lakes and seas, then evaporate again.

Compare with Earth

A rotorcraft is coming

NASA's Dragonfly is due to launch no earlier than July 2028 and arrive in late 2034, then fly between sites for a planned 3.3-year mission.

How we explore

An artist's style impression of a rotorcraft lander with eight rotors standing on a dusty brown plain under a hazy orange sky — AI-generated image, not a photograph of a real person or place.

FOUR VISITS TO TITAN

From a flyby
to a flying lab.

Titan was discovered in 1655. Spacecraft have been revealing it, layer by layer, since 1979.

1979: the first flyby
Pioneer 11 became the first spacecraft to explore Titan as it flew through the Saturn system on 1 September 1979.
Cassini: seeing through the haze
Cassini's gravity measurements revealed that Titan hides an underground ocean of liquid water, likely mixed with salts and ammonia.
2005: Huygens lands
ESA's probe landed on Titan and measured radio signals suggesting an ocean 55 to 80 km below the icy ground.
2030s: Dragonfly flies
The rotorcraft will make a flight every one to two Titan days, about 16 Earth days each, sampling dunes and a crater.

TWO NUMBERS WORTH KNOWING

Bitterly cold,
heavily wrapped.

One figure from the ground,
one from the air above it.

−179 °C

Temperature on Titan's surface

At about minus 179 °C, water ice behaves like rock, and dunes of dark hydrocarbon grains, thought to look like coffee grounds, stretch across the equator.

SURFACE · NASA

+60%

Surface pressure compared with Earth

Titan's surface pressure is about 60% greater than Earth's. Its weaker gravity lets the atmosphere extend to nearly 600 km, about ten times higher than ours.

ATMOSPHERE · NASA

On 14 January 2005 ESA's Huygens probe descended for two and a half hours under parachutes to Titan's surface: the most distant landing ever made on another world.

A QUICK EARTH CHECK

How alien
is Titan?

Pick a feature to compare Titan with Earth. The bar shows how different Titan is from home.

Figures from NASA's Titan facts page.

Earth check

Choose a featureWhat the air is made ofAir pressure at the surfaceWhat fills the lakesLength of a seasonSurface temperature

What the air is made ofMostly nitrogen

Like Earth's, Titan's atmosphere is mostly nitrogen, about 95%, with about 5% methane and small amounts of other carbon-rich compounds.

Air pressure at the surfaceAbout 60% higher

Roughly what you would feel swimming 15 metres under the sea on Earth. The atmosphere reaches about 600 km up, ten times higher than Earth's.

What fills the lakesMethane and ethane

Titan has a full cycle of rain, rivers, lakes and evaporation, like Earth's water cycle, but with liquid hydrocarbons.

Length of a seasonOver 7 Earth years

Titan follows Saturn round the Sun, so its year lasts about 29 Earth years and each season lasts more than seven.

Surface temperature−179 °C

So cold that water ice plays the part of rock. Sunlight there is about 100 times fainter than on Earth.

Source: NASA Science, Titan facts.

An artist's style impression of a dark, still lake under a thick orange sky, its shore scattered with rounded pebbles of ice — AI-generated image, not a photograph of a real person or place.

COULD ANYTHING LIVE THERE?

Two kinds
of possible habitat.

A global ocean of liquid water beneath the ice puts Titan among the few worlds in our solar system that could have habitable environments, for life as we know it.

Its surface lakes of methane and ethane might also host life very different from Earth's. There is so far no evidence of life on Titan. Dragonfly is designed to study the chemistry that came before biology, not to detect life.

In conversation

Questions people ask

Is Titan bigger than our Moon?

Yes. Titan is nearly 50% wider than Earth's Moon and larger than the planet Mercury. It is the second largest moon in the solar system, after Jupiter's Ganymede, which is only about 2% bigger.

Does it really rain on Titan?

Yes, but not water. Methane condenses into clouds and falls as rain, filling rivers, lakes and seas, then evaporates back into the sky, much like Earth's water cycle.

Why is Titan orange?

Sunlight and charged particles break apart methane and nitrogen high in the atmosphere. The pieces recombine into organic chemicals that form a thick orange haze.

Has anything landed on Titan?

Yes. ESA's Huygens probe, carried by NASA's Cassini spacecraft, landed on 14 January 2005 after a two-and-a-half-hour parachute descent. ESA describes it as the most distant landing ever made on another world.

Who discovered Titan and how did it get its name?

It was discovered on 25 March 1655. The discoverer called it Luna Saturni, Latin for Saturn moon; the name Titan, after the Titans of Greek mythology, came later.

Sources

Each figure on this page comes from the sources below.

It rains on Titan.
Just not water.