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Scientists interpreted this phenomenon to mean that there may be an underground ocean of liquid water on Europa. The Galileo orbiter detected a magnetic field near the moon that was inconsistent with what scientists would expect from a moon made of solid rock and ice. This led them to hypothesize that a salty ocean of liquid water may be hidden beneath Europa's icy crust.
1. The Galileo Orbiter detected a powerful and localized magnetic field emanating from the surface of Europa.
2. Scientists hypothesized that this localized magnetic field was caused by the interaction between Europa's subsurface ocean and the magnetic field of Jupiter.
3. Scientists theorized that the magnetic field was evidence of a salty, liquid ocean beneath the moon's icy crust.
4. This ocean is thought to be at least twice the volume of all the Earth's oceans combined.
5. The presence of liquid water in such a large volume is a promising sign for the possibility of life on Europa.
6. This is because liquid water is necessary for life as we currently know it, and the presence of a heated ocean beneath the surface of Europa could provide the necessary energy and resources for life.
The Galileo Orbiter was an unmanned spacecraft sent by NASA to explore Jupiter and its moons. It was launched in 1989 and arrived at Jupiter in 1995. It was the first spacecraft to orbit Jupiter and it made numerous discoveries, including confirming the existence of liquid oceans beneath Europa's icy surface. It also detected a magnetic field around Jupiter and studied the planet's atmosphere and radiation belts. Galileo also sent back numerous images of Jupiter and its moons, which provided new insights into their composition and structure. It operated until 2003, when it was deliberately de-orbited into Jupiter's atmosphere.
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