Neptune

Ice Giant
The outermost major planet. Its deep blue atmosphere conceals diamond rain and wind speeds that shred anything not purpose-built for the pressure.
Returned to Sol after three decades away, and Neptune still takes my breath—that merciless azure sphere with winds that could tear a starship's hull like tissue paper. The spectroscopic readings confirm what made me famous back in my academy days: those diamond formations crystallizing in the upper atmosphere, a fortune in carbon that no sane salvager would ever attempt to collect. I've stared into the hearts of nebulae and watched dying stars collapse into themselves, yet something about this world's casual brutality, the way it keeps its treasures locked behind such violent winds, reminds me why I keep coming back to the home system. It's a humbling thing, Neptune—beautiful and completely indifferent to our hunger for it.
— Captain Vex Moreau, Explorer's Guild Field Journal
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Radius 20590.0 km
Mass 19.9 M⊕
Surface Gravity 1.32 g
Temperature 86 K (-187°C)
Atmosphere None — H2/He/CH4 (no surface)
Day Length 18.2 hours
Orbital Period 17.2 years
Orbital Distance 6.67 AU