September 16, 2021


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Vue d'artiste de Jupiter et Ganymède, une des quatre lunes Galiléennes de Jupiter. © ESA, Hubble, M. Ail

Vapor was detected in the atmosphere of the solar system’s largest moon, the cone

Based on Hubble’s observations in 1998, 2010 and 2018, steam was detected in the atmosphere of the cone, reinforcing the moon’s attractiveness. The moon, which will be closely monitored by ESA’s Juice Research from 2029, neutralizes seawater in liquid form. The latter may be optimal for the existence of a life form!

For the first time, Astronomers Detected water vaporAtmosphere Ganymede, one of Jupiter’s four Galilean moons. This finding reinforces its interest நிலா We know today that she is There is a sea of ​​liquid salt water, Trapped between two layers of ice more than 160 km from its surface. Just like Europe CallistoThe other two moons of Jupiter.

We owe this discovery to a team of astronomers Lawrence Roth You KTH Royal Institute of Technology From Stockholm, Sweden, digs up old dataHubble In order to prepare observations of Mission Juno, This incredible invention. In fact, underlined ESA and NASA press release, Where there is water there may be life as we know it “However, if this condition is necessary for the existence of a life form, no matter how simple it may be, it is not enough. You need energy and essential elements ( Carbon C, L ‘Hydrogen H, L ‘Azot N, l ‘Oxygen Of Phosphorus B and The Sulfur S) Compiled under the acronym CNOPS.

Initial data was misunderstood

By comparing the spectra made by the Hubble Stylus instrumentUV In 1998 and 2010, with the most recent observations in 2018 by the COS instrument to measure the amount of atomic oxygen in the atmosphere of the galaxy, astronomers realized that the initial data had been misunderstood. Although this is considered from 1998 observations, the presence of nuclear oxygen in the atmosphere Conimet, Astronomers concluded, in the end, unlike the high molecular weight oxygen in the galaxy’s atmosphere.

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To illustrate this finding, Lawrence Lot’s team found that the surface temperature of the conimeter is close throughout the day and at noon.equator, The surface of the ice is hot enough to emit small amounts Molecules Water. In fact, the differences between the UV images obtained at different times (from 1998, 2010 and 2018) are directly related to the expected location of water in the lunar atmosphere. ” Initially, o2 Observed, Explained Lawrence Roth. This occurs when charged particles erode the surface of the ice. The water vapor we now measure comes from the sublimation of ice caused by heat vapor leakage from H.2O Warm icy areas. »

Jupiter’s moons are believed to be home to deep habitats

This finding reinforces the glamor Work juice Its purpose is to monitor the European Space Agency, especially Canyme. Launched in 2022, Juice Will reach Jupiter in 2029. He will work for at least three years to observe Jupiter and carry out in-depth studies of its three largest frozen moons (Europa, GoneMite and Callisto). ” Beyond ours, juice can be very important in determining the viability of planets that can show oceans. “Underlined, Günther Hasinger, Director of Science Programs at ESA. If the schedule goes as planned, this work is expected to be completed by June 2033.

Lawrence Roth’s team results so ” Provide juice tool groups with accurate information to streamline monitoring programs to improve juice usage .

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