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...Source: NASA/Lunar and Planetary Institute/Paul Schenk Density measurements made by Galileo also showed that Europa had a solid, dense interior, probably made of a metallic core surrounded by rock, and a thin atmosphere containing oxygen and ozone. However, one of the mission’s most significant findings was that the moon also had a magnetic field. This meant that Europa...

...sources, such as cometary ice and water extracted from hydrated minerals, to assess what elements could be released into the ocean. [Interior of Europa and the ocean-seafloor boundary]Figure 3 An illustration of water-rock interactions occurring at the ocean-seafloor interface of Europa. Credit: Lewis Sym.Show descriptionThere are two illustrations side by side. The left...

...sources. One was the need to develop practical knowledge and to pass it from generation to generation. The other was a more spiritual concern with the nature and origin of the world. Common to both of these well-springs of science was an appreciation of the regularity of Nature. The way to build an arch that would not fall down today was to build it in much the same way...