Doom Mons, one of the most reliably identified cryovolcanoes on Saturn's moon Titan
Europa's trailing hemisphere in approximate natural colour. The prominent crater in the lower right is Pwyll and the darker regions are areas where Europa's primarily water ice surface has a higher mineral content. Imaged on 7 September 1996 by Galileo spacecraft.
Plumes of Enceladus, feeding Saturn's E Ring, seem to arise from the "Tiger Stripes" near the south pole.
William Lassell, the discoverer of Triton
Animation of the Laplace resonance of Io, Europa and Ganymede (conjunctions are highlighted by color changes)
The orbit of Triton (red) is opposite in direction and tilted −23° compared to a typical moon's orbit (green) in the plane of Neptune's equator.
Size comparison of Europa (lower left) with the Moon (top left) and Earth (right)
Animation of Triton
Approximate natural color (left) and enhanced color (right) Galileo view of leading hemisphere
The Kuiper belt (green), in the Solar System's outskirts, is where Triton is thought to have originated.
Realistic-color Galileo mosaic of Europa's anti-Jovian hemisphere showing numerous lineae
Artist's impression of Triton, showing its tenuous atmosphere just over the limb.
Enhanced-color view showing the intricate pattern of linear fractures on Europa's surface
Clouds observed above Triton's limb by Voyager 2.
Two possible models of Europa
Interpretative geomorphological map of Triton
Europa - internal structure
(artwork; 25 May 2021)
Triton's bright south polar cap above a region of cantaloupe terrain
Closeup views of Europa obtained on 26 September 1998; images clockwise from upper left show locations from north to south as indicated at lower left.
Cantaloupe terrain viewed from 130,000 km by Voyager 2, with crosscutting Europa-like double ridges. Slidr Sulci (vertical) and Tano Sulci form the prominent "X".
Water plumes on Europa detected by the Galileo space probe
Tuonela Planitia (left) and Ruach Planitia (center) are two of Triton's cryovolcanic "walled plains". The paucity of craters is evidence of extensive, relatively recent, geologic activity.
Photo composite of suspected water plumes on Europa
NASA illustration detailing the studies of the proposed Trident mission
Magnetic field around Europa. The red line shows a trajectory of the Galileo spacecraft during a typical flyby (E4 or E14).
Neptune (top) and Triton (bottom) three days after flyby of Voyager 2
A black smoker in the Atlantic Ocean. Driven by geothermal energy, this and other types of hydrothermal vents create chemical disequilibria that can provide energy sources for life.
thumb|Close up of the volcanic province of Leviathan Patera, the caldera in the center of the image. Several pit chains extend radially from the caldera to the right of the image, while the smaller of the two cryolava lakes is seen to the upper left. Just off-screen to the lower left is a fault zone aligned radially with the caldera, indicating a close connection between the tectonics and volcanology of this geologic unit.
Europa – possible effect of radiation on biosignature chemicals
thumb|Dark streaks across Triton's south polar cap surface, thought to be dust deposits left by eruptions of nitrogen geysers
thumb|Two large cryolava lakes on Triton, seen west of Leviathan Patera. Combined, they are nearly the size of Kraken Mare on Titan. These features are unusually crater free, indicating they are young and were recently molten.

Triton is one of the few moons in the Solar System known to be geologically active (the others being Jupiter's Io and Europa, and Saturn's Enceladus and Titan).

- Triton (moon)

A number of features have been identified as possible cryovolcanoes on Pluto, Titan and Ceres, and a subset of domes on Europa may have cryovolcanic origins.

- Cryovolcano

In addition, although they are not known to form volcanoes, ice geysers have been observed on Enceladus and potentially Triton.

- Cryovolcano

Intricate cryovolcanic and tectonic terrains suggest a complex geological history.

- Triton (moon)

Impurities in the water ice crust of Europa are presumed both to emerge from the interior as cryovolcanic events that resurface the body, and to accumulate from space as interplanetary dust.

- Europa (moon)

Europa is one of the only moons in our solar system with a quantifiable atmosphere, next to Titan, Io, Triton, Ganymede and Callisto.

- Europa (moon)
Doom Mons, one of the most reliably identified cryovolcanoes on Saturn's moon Titan

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