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Earth 's surface is dominated by the ocean, which forms 75% of Earth's surface. An ocean world, ocean planet or water world is a type of planet that contains a substantial amount of water in the form of oceans, as part of its hydrosphere, either beneath the surface, as subsurface oceans, or on the surface, potentially submerging all dry land.
Extraterrestrial liquid water. Extraterrestrial liquid water is water in its liquid state that naturally occurs outside Earth. It is a subject of wide interest because it is recognized as one of the key prerequisites for life as we know it and is thus surmised to be essential for extraterrestrial life. [1]
This was announced along with another new world, Gliese 581 e, which is next to twice the mass of Earth but too close to its sun for liquid water. In May 2011, a new study suggested that the planet might have a thick atmosphere, oceans and even life. [25] The unconfirmed planet Gliese 581 g is another good candidate.
Astronomers have found water in a disc that could be forming planets ... reveal at least three times as much water as in all of Earth’s oceans in the inner disc of the young Sun-like star HL ...
Astronomers have detected water vapor swirling close to a nearby star — indicating that the planets forming around it might someday be able to support life. The young planetary system, known as ...
The current Venusian atmosphere has only ~200 mg/kg H 2 O(g) in its atmosphere and the pressure and temperature regime makes water unstable on its surface. Nevertheless, assuming that early Venus's H 2 O had a ratio between deuterium (heavy hydrogen, 2H) and hydrogen (1H) similar to Earth's Vienna Standard Mean Ocean Water of 1.6×10 −4, [7] the current D/H ratio in the Venusian atmosphere ...
The atmosphere of Earth is composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans ), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes ), all retained by Earth's gravity.
TRAPPIST-1e, also designated as 2MASS J23062928-0502285 e, is a rocky, close-to-Earth-sized exoplanetorbiting within the habitable zonearound the ultracool dwarfstar TRAPPIST-1, located 40.7 light-years(12.5 parsecs; 385 trillionkilometers; 239 trillion miles) away from Earth in the constellation of Aquarius.