The Existence of an Ocean on Ganymede Strengthens Hopes of Finding Life

NASA announced on Thursday, March 11, that scientists using the Hubble Space Telescope have confirmed that Ganymede, one of Jupiter's moons, has an ocean beneath its icy surface. The discovery of water on the largest moon in the solar system enhances hopes for the existence of life in this part of space. According to Reuters, this discovery solves the mystery of the largest moon in the solar system. During the Galileo spacecraft's missions from 1995 to 2003, information was gathered regarding the potential existence of a subsurface ocean on Ganymede. Scientists stated in a conference call to reporters that extensive investigative work has been done to confirm this finding. Ganymede, like Earth, has a molten metal core that generates a magnetic field. This feature has created an interesting backdrop for visual phenomena such as the bright auroras in Ganymede's northern and southern poles. As Jupiter rotates, its magnetic field shifts, causing the bright auroras of Ganymede to oscillate. Scientists measured this displacement and noticed a deficiency. They used computer models to find that a salty ocean, which conducts electricity and lies beneath the surface of Jupiter's moon, influences the magnetic poles of Jupiter. Joachim Sauer, a geophysics professor at the University of Cologne in Germany, said, 'Jupiter is like a lighthouse whose magnetic field changes with the displacement of the lighthouse. Under the influence of this ocean, the angle of displacement significantly decreases.' The report adds that scientists constructed over a hundred computer models to investigate the impact of another potential factor on Jupiter's bright auroras. They also analyzed data related to two bright belts by repeating a seven-hour ultraviolet observation of evidence recorded by the Hubble Space Telescope. Joachim Sauer stated, 'This method assures us of the accuracy of our measurements.' Jim Green, the director of NASA's astronomy science division, described this discovery as 'an astonishing proof' and said, 'They have developed a new method for observing the interiors of celestial bodies with telescopes.' Thus, Ganymede is added to the list of moons in the solar system that have water beneath their surfaces. On March 11, scientists reported that Saturn's moon Enceladus also has hot springs beneath its icy crust. Europa and Callisto, other moons of Jupiter, also have water reserves. Scientists estimate that the depth of Ganymede's ocean is about 100 kilometers, which is ten times the depth of Earth's oceans, and is buried beneath a 150-kilometer thick ice shell. Heidi Hammel, an astronomer at the Association of Universities for Research in Astronomy based in Washington, said, 'This finding is a step towards finding water-rich environments in the farther reaches of the solar system.'