Beneath sandy dunes at the equator, which are rich with complex carbon molecules, lies a crust of water ice perhaps 100 km thick. Titan’s veiling haze is probably composed of an aerosol of complex organic solids produced by solar ultraviolet light falling on the nitrogen-methane atmosphere. These particles absorb solar radiation and account for the deep brownish red tint. They are substantially dense even at altitudes as high as 300 km (200 miles) and pressures below one millibar. Our solar system is home to more than 150 moons, but Titan is unique in being the only moon with a thick atmosphere. At the surface of Titan, the atmospheric pressure is about 60 percent greater than on Earth—roughly the same pressure a person would feel swimming about 50 feet (15 meters) below the surface in the ocean on Earth.

Moons

Scientists think the sand is not made of silicates as on Earth, but of solid water ice coated with hydrocarbons that fall from the atmosphere. Images show Titan’s icy dunes are gigantic, reaching, on average, 0.6 to 1.2 miles (1 to 2 kilometers) wide, hundreds of miles (kilometers) long and around 300 feet (100 meters) high. ◆ Data from Cassini-Huygens revealed Titan has lakes and seas of liquid methane and ethane, replenished by rain from hydrocarbon clouds. The surface of Titan is one of the most Earthlike places in the solar system, albeit at vastly colder temperatures and with different chemistry. Here it is so cold (-290 degrees Fahrenheit or -179 degrees Celsius) that water ice plays the role of rock. Titan may have volcanic activity as well, but with liquid water “lava” instead of molten rock.

• NASA scientists have found evidence that cell-like structures known as vesicles could naturally develop within the lakes of Saturn’s moon Titan.
• Surrounding the core is a shell of water ice—a special type called ice-VI that is only found at extremely high-pressures.
• In both cases, the moon and its shadow will appear across the surface of the planet in the Northern Hemisphere.
• Astronomer William Henry Pickering claimed to have discovered another moon of Saturn which he named Themis, but this discovery was never confirmed, and the name Themis was given to an asteroid, 24 Themis.

Plains and dunes

Cassini revealed that Titan experiences a dynamic weather system that continues to shape its surface today. The atmosphere is composed primarily of nitrogen, with a notable proportion of methane (CH₄). This methane condenses into clouds and produces rain, which falls to the surface, carving river channels and contributing to erosion before collecting in lakes and seas. Under sunlight, the liquid evaporates back into the atmosphere, forming clouds once more.

Huygens also directly sampled aerosols in the atmosphere and confirmed that carbon and nitrogen are their major constituents. This four-panel infographic demonstrates a key chemical process believed to occur in the atmosphere of Saturn’s moon Titan. 1) Titan has a thick, nitrogen (N 2 ) atmosphere that also contains methane (CH 4 ). Researchers propose that vesicles could form in Titan’s hydrocarbon lakes, hinting at a new pathway for life’s precursors.

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If a droplet then lands on the surface of a pond, the two layers of amphiphiles meet to form a double-layered (or bilayer) vesicle, enclosing the original droplet. Over time, many of these vesicles would be dispersed throughout the pond and would interact and compete in an evolutionary process that could lead to primitive protocells. This hydrocarbon chemistry has long-term implications for the future of Titan. When methane is broken apart in the upper atmosphere, some of it recombines to make other molecules that eventually end up on Titan’s surface in one chemical form or another, while some hydrogen escapes from the atmosphere. As a result, methane will be depleted over time, unless there is some source to replenish it. The team observed Titan in November 2022 and July 2023 using both Webb and one of the twin ground-based W.M.

• Because sunlight continuously breaks down methane in Titan’s atmosphere, some source must be replenishing it or it would be depleted over time.
• But Cassini mapped Titan’s surface, studied its atmospheric reactions, discovered liquid seas there and even sent a probe to the moon’s surface, completely rewriting our understanding of this remarkably Earth-like world.
• It is believed that methane and ethane rain falls from clouds in Titan’s atmosphere, but the ultimate source of the methane is still unclear.
• Until the Cassini mission, little was known about Saturn’s largest moon Titan, save that it was a Mercury-sized world whose surface was veiled beneath a thick, nitrogen-rich atmosphere.

The reason for the alignment is that Earth and Saturn have a similar tilt with respect to their orbital planes around the Sun. The inclinations of their planetary orbits are also close to each other, respectively 1.57 degrees and 0.93 degrees, with respect to the invariable plane of the Solar System. «The Dragonfly team is killing it,» said Bobby Braun, who is head of APL’s Space Exploration Sector, in an interview. «Probably the best part of my day is watching that team hit their milestones.»

Cassini–Huygens

Those observations not only showed clouds in the mid and high northern latitudes on Titan – the hemisphere where it is currently summer – but also showed those clouds apparently rising to higher altitudes over time. While previous studies have observed cloud convection at southern latitudes, this is the first time evidence for such convection has been seen in the north. This is significant because most of Titan’s lakes and seas are located in its northern hemisphere and evaporation from lakes is a major potential methane source.

Saturn’s largest moon, Titan, is named after the Titans generally, and the other moons of Saturn are named after individual Titans, specifically Tethys, Phoebe, Rhea, Hyperion, and Iapetus. Astronomer William Henry Pickering claimed to have discovered another moon of Saturn which he named Themis, but this discovery was never confirmed, and the name Themis was given to an asteroid, 24 Themis. Among the key technologies on Dragonfly is an advanced Terrain Relative Navigation system to survey the surface and identify hazards.

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Although there is so far no evidence of life on Titan, its complex chemistry and unique environments are certain to make it a destination for continued exploration. The atmosphere of Titan is mainly nitrogen and methane; minor components lead to the formation of hydrocarbon clouds and heavy organonitrogen haze. Its climate—including wind and rain—creates surface features similar to those of Earth, such as dunes, rivers, lakes, seas (probably of liquid methane and ethane), and deltas, and is dominated by seasonal weather patterns as on Earth. With its liquids (both surface and subsurface) and robust nitrogen atmosphere, Titan’s methane cycle nearly resembles Earth’s water cycle, albeit at a much lower temperature of about 94 K (−179 °C; −290 °F). Due to these factors, Titan is sometimes called the most Earth-like celestial object in the Solar System. Titan is primarily composed of ice and rocky material, with a rocky core surrounded by various layers of ice, including a crust of ice Ih and a subsurface layer of ammonia-rich liquid water.

Like Earth, Titan’s atmosphere is primarily nitrogen, plus a small amount of methane. It is the sole other place in the solar system known to have an earthlike cycle of liquids raining from clouds, flowing across its surface, filling lakes and seas, and evaporating back into the sky (akin to Earth’s water cycle). Cassini followed up Huygens’ measurements from space, detecting other chemicals that included propylene (a chemical used to make household plastic) and poisonous hydrogen cyanide, in Titan’s atmosphere. The variety of chemicals observed indicates a rich and complex chemistry originating from methane and nitrogen and evolving into complex molecules, eventually forming the smog that surrounds the icy moon. It is believed that methane and ethane rain falls from clouds in Titan’s atmosphere, but the ultimate source of the methane is still unclear.

These images of Titan were taken by NASA’s James Webb Space Telescope on July 11, 2023 (top row) and the ground-based W.M. They show methane clouds (denoted by the white arrows) appearing at different altitudes in Titan’s… It’s possible that it is being constantly resupplied and fizzing out of the titan v price crust and interior over billions of years.

As it descended for two and a half hours, Huygens took measurements of Titan’s atmospheric composition and pictures of its surface. The hardy probe not only survived the descent and landing, but continued to transmit data for more than an hour on Titan’s frigid surface, until its batteries were drained. For centuries, Titan’s thick, golden haze obscured its surface and kept much about it unknown. This changed in 2004, when NASA’s Cassini spacecraft entered Saturn’s system, dramatically transforming scientific understanding of the moon. «Titan’s equatorial region has these large seas of sand dunes, but the sand has an organic composition, and it overlies this primordial water ice crust,» Turtle said. In an interview, Dragonfly Principal Investigator Elizabeth «Zibi» Turtle told Ars the vehicle’s mobility will allow it to investigate areas in which this ice may have been liquid in the past.

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Titan is the only other place in the solar system known to have an Earth-like cycle of liquids flowing across its surface as the planet cycles through its seasons. Cassini caught glimpses of the transition from fall to winter at Titan’s south pole—the first time anyone has seen the onset of a Titan winter—and watched as summer came to the north. “We’re monitoring the weather on Titan, watching for predicted methane rainstorms at the north pole,” Linda Spilker, Cassini project scientist at NASA’s Jet Propulsion Laboratory, said at the time. Before Cassini-Huygens began its focused study of Saturn’s largest moon, we knew Titan as a hazy orange ball about the size of Mercury. Scientists had determined it had a nitrogen atmosphere—the only known world with a dense nitrogen atmosphere besides Earth.