Figure 12.5 Interior structure of Neptune.

than the core of Uranus. Surrounding the core is a mantle of liquid hydrogen and an outer layer or ocean of water mixed with methane and ammonia. However, Neptune's interior layers may not be distinct and uniform. Like Jupiter and Saturn, Neptune produces its own heat - it radiates more than twice as much energy as it receives from the Sun.

The strength of gravity on Neptune is greater than Earth's gravity (11.2 N/kg compared to Earth's 9.8 N/kg). This means that a 75 kg person weighing 735 N on Earth would weigh 840 N on Neptune.

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