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NASA Mundos oceánicos

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Oceans worlds presented by Scince at NASA Earth a world dominated by water trillions of gallons flow freely across the surface of our bluegreen planet while we once thought oceans made our planet unique we're now coming to realize that ocean worlds are all around us our planet retains its atmosphere and in turn it is abundant of liquid water thanks in part to a very strong magnetic field which provides protection from the solar wind without this magnetic field our atmosphere will be stripped away leaving the pale blue dot looking more like one of our neighbors? Scientists believe Venus's early oceans evaporated with no water left on the surface carbon dioxide built up in the atmosphere leading to a runaway greenhouse effect that created present conditions likewise Mars appears to have had oceans long ago but the red planet's global magnetic field decayed leaving it vulnerable to atmospheric erosion by the solar wind. Farther from the Sun in the sub-freezing temperatures of the outer solar system it may seem impossible for liquid water to exist however not only does it exist but in some places it may be more more abundant than on earth Jupiter is orbited by at least three moons that contains oceans Europa, Ganymede and Callisto Europa is criss-crossed by cracks and semi-regtangular features that look like ice rafts frozen into the surface below those a mobile icebergs researchers believe there is a vast ocean just below the icy crust warmed by the tidal forces of Jupiter containing about twice as much water as is found on earth. In 2014 and 2016 the Hubble Space Telescope has observed what appeared to be water vapours plummes coming out of the craks near the South Pole photos of Ganymede from the Galileo space probe show ancient ice floes frozen into its surface moreover Hubble has looked at Ganymedes auroras and seeing signs suggesting an oceans worth of salt water hiding beneath a thick crust of ice the ocean on Ganymede could actually harbour as much as four times more water than all of Earth's oceans combined Callisto also seems to contain a saltwater ocean beneath the icy crust betraying its presence by the effects of Callisto on Jupiter's overlying magnetic field In 2005 NASA's Cassini spacecraft found Saturn's moon Enceladus busily puffing plumes of water vapor and organic compounds out through fissures now known as tiger strips in its frozen carapace Cassini flew through the plumes frequently since then and has discovered nano silica grains and the presence of molecular hydrogen both suggesting the movement of heated water on the sea floor of the icy moon. Other evidence provided by Cassini has convinced researchers that Enceladus has a global subsurface ocean steaming into space through these tiger stripes Saturn's earring the planet's second outermost ring was actually formed from this water and ice Saturn's largest moon Titan has a landscape dotted with lakes and seas the liquid on Titan's surface is not however H2O researchers believe the fluid sculpting Titans surface is a mixture mostly of methane with smaller amount of ethane and other hard to freeze hydrocarbons Other bodies around the solar system also show signs of liquid water In 2014 scientists using the European Space Agency led Herschel Space Observatory detected water vapor coming from two regions of the dwarf planet Ceres NASA's dawn probe reached Ceres in 2015 and while the water vapor had subsided there were other signs of water Ahuna Mons is an ice mountain apparently formed from repeated eruptions of salty muddy water also widely reported bright spots in Ceres crater Occator are thought to be deposits of salt left behind by the escape and sublimation of briny water from below Even distant Pluto may be an ocean world as revealed by the recent flyby of New Horizon Pluto's strangely moulded surface features suggest the presence of a liquid underground As astronomers look beyond our solar system they are finding exoplanets of sizes and distances from their stars that could have oceans and based on our solar system these exoplanets could potentially have moons with oceans as well The location of water within the diverse environments of our own planetary system will guide and inform the search for oceans beyond our solar system . Next time you look out over the ocean think about our neighboring worlds they may have more in common with our own ocean world than we once believed was possible For more news about oceans at home and abroad stay tuned to science.nasa.gov

Video Details

Duration: 5 minutes and 51 seconds
Year: 2017
Country: United States
Language: English
License: Dotsub - Standard License
Producer: NASA Science
Views: 10
Posted by: ftruccoh on May 9, 2017

NASA Mundos oceánicos
Fuente:NASA Science: https://www.nasa.gov/press-release/nasa-missions-provide-new-insights-into-ocean-worlds-in-our-solar-system

Subtítulos en español: Fernando Trucco
http://fgtruccotranslations.blogspot.com.br/

Este vídeo muestra los hallazgos de las misiones Cassini y Hubble de la NASA. Nuevos detalles sobre las heladas lunas oceánicas de Júpiter y Saturno, han aumentado aún más el interés científico de estos y otros "mundos oceánicos" en nuestro sistema solar y más allá.

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