In the late 2020s, the European Juice Sonar will provide more information about the largest moon in the solar system and its waters.
Our solar system water vapor has been found in the atmosphere of the largest moon, Ganymedes.
It is created when the icy surface of Ganymedes evaporates slightly from ice to gas. This is what happens near the lunar equator.
The discovery was made surprisingly by comparing images taken by the Hubble Space Telescope a long time ago with current ones, the U.S. Space Agency NASA in the bulletin is told.
Hubble first photographed Ganymede in 1996 from Earth’s orbit, more than 600 million miles from the site.
Years ago, there was indirect evidence that there is a great deal of water in Ganymede.
It is estimated that there is more water under the shell of the big moon, at a depth of about 150 kilometers, than in all the oceans of the earth combined.
Water Ganymede can hold, for the moon is larger than the smallest planet in the solar system, Mercury, and also larger than the dwarf planet Pluto. Ganymedes is 5,262 kilometers in diameter.
The big moon is so cold that the surface water is almost always frozen.
Space telescope Hubblen using a spectrograph the first ultraviolet images of this month of Jupiter were taken in 1998.
The pictures revealed colorful, ribbon-like patterns near the lunar equator. They were electrified gases. They gave indications that Ganymede has a weak magnetic field.
The belts of medium-width charged particles are similar to the northern lights of the earth.
Read more: The pale spots of the dwarf planet Ceres are salt that rises beneath the surface of the great sea
Ultraviolet images were explained by the fact that they show different forms of oxygen.
Oxygen is in the form of molecules of two oxygen atoms, but there is also one atom of atomic oxygen in space. The differences affect one wavelength of ultraviolet light.
The researchers concluded that the differences were likely related to higher concentrations of atomic oxygen. Thus, the image supposedly only revealed that oxygen was not in molecular form in Jupiter’s atmosphere.
Jupiteria rotate now probe Juno. When the scientific program for the sonar was designed, the researcher received Lorenz Roth with his team in 2018 to study the amount of oxygen in Ganymede.
Roth is a researcher at the Royal Institute of Technology in Stockholm.
The group used ultraviolet images of Ganymede from different times. One of the images had been taken by Hubble’s spectrograph in 2018. The second series of images included images taken by Hubble in 1998–2010.
When Roth compared the images from different years, no atomic oxygen was found in the 2018 images. It was a surprise.
Ultraviolet for certain colors in the images I had to find another explanation.
Roth and his group took a closer look at the northern lights-like distribution of ultraviolet images, i.e., near the lunar equator.
The observed differences in the images corresponded quite closely to the amount and distribution of water vapor assumed to be in the Ganymedes atmosphere, but it was not observed.
In the ultraviolet images, therefore, water vapor was also emitted.
The surface temperature of Ganymedes varies greatly with sunshine. Herein lies the explanation of water vapor.
During the day, the surface can become warm enough for the phenomenon where some water molecules are released from the icy surface, says website Science Alert.
To Jupiter and its moons will be sent by the European Space Agency’s ESA sonar Juice maybe as early as next year. It will certainly take a closer look at this phenomenon.
Juice arrives at Jupiter in 2029 and explores the icy worlds of other Jupiter moons for at least three years. Now he is studying Jupiter and eventually its moons as well Nasa’s Juno sonar.
In addition to Nasa, a scientific journal reported about the water vapor in Ganymedes Nature Astronomy.
Read more: For the first time, water was found on a planet outside the solar system