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According to Lunine, "oceans" have been defined as "stable, globe-girdling bodies of liquid water." [13] In addition, "Ocean worlds is the label given to objects in the solar system that host stable, globe-girdling bodies of liquid water," in contrast to the terms "'ocean planet' and 'water world', both of which refer to exoplanets (planets orbiting other stars) with substantial mass fractions ...
A hycean planet is a hypothetical type of planet with liquid water oceans under a hydrogen atmosphere. [1] The presence of extraterrestrial liquid water makes hycean planets regarded as promising candidates for planetary habitability. [2] [3] [4] They are usually considered to be larger and more massive than Earth. [5]
Planetary oceanography, also called astro-oceanography or exo-oceanography, [1] is the study of oceans on planets and moons other than Earth.Unlike other planetary sciences like astrobiology, astrochemistry, and planetary geology, it only began after the discovery of underground oceans in Saturn's moon Titan [2] and Jupiter's moon Europa. [3]
Currently, cold surface bodies of liquid are found on two worlds in the Solar System, Earth and Saturn's moon Titan. [1] Earth is the only planet with liquid water on its surface. The other "oceans" are found under thick covers of surface ice. If both liquid and frozen water are counted, Earth ranks fifth in volume of its oceans. [2]
Artist's impression of a class II planet with water vapor clouds, as seen from a hypothetical large moon with surface liquid water. A planet's orbit in the circumstellar habitable zone is a popular method used to predict its potential for surface water at its surface.
Story at a glance (NewsNation) — Data from the James Webb telescope has suggested there is liquid water on an exoplanet that could be a super-Earth ice planet. Known as LHS 1140 b, the exoplanet ...
MOA-2007-BLG-192Lb is a small planet orbiting a small star. It is about 3 Earth masses, currently the second smallest detected extrasolar planet orbiting a normal star, after Gliese 581 e. The planet orbits its host star or brown dwarf with an orbital radius similar to that of Venus.
Icy moons warmed by tides may be the most common type of celestial body in the galaxy to have liquid water, [3] and thus the most likely type of object to possibly have water-based life. Some icy moons exhibit cryovolcanism, as well as geysers. The best studied example is Saturn's Enceladus.
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