Scientists believe several of their satellites might contain the conditions for life. Candidates include Europa and Enceladus
, they look like scratches. But zooming in on the surface of Europa, one of Jupiter’s 79 known moons, reveals that the structures criss-crossing it are gigantic canyons. They are not as otherworldly as they appear: similar features are found in Greenland, formed by the repeated freezing and thawing of water below its surface ice-sheet. If Europa’s ridges were fashioned in the same way, it would support the theory that it has a huge ocean lurking beneath its own icy shell.
If approved, it would join a series of trips already planned to Jupiter’s and Saturn’s moons. In 2023 Europe’swill embark on a 12-year journey, during which it will study Europa, Callisto and Ganymede to see if any have the potential to support life. It will be joined by NASA’s, scheduled to launch in 2024. Perseverance, a NASA rover which launched in 2020, is searching for historic evidence of life on Mars and the agency will continue to study the planet.
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