Neptune and Uranus are primarily composed of hydrogen and helium, with trace amounts of other elements. They are often categorized as ice giants due to the presence of various volatiles, such as water, methane, and ammonia, in their interiors.
Understanding the interiors of these planets requires sophisticated models and analyzing data obtained through various remote sensing techniques, such as spectroscopy and gravitational measurements. While the presence of salts or specific chemical compounds within these planets can provide insights into their formation and evolution, salt alone is not considered a key to unlocking their interiors.
