this post was submitted on 23 Apr 2026
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Some Sci-Fi planet types are reasonable.
The Kepler program found a lot of exoplanets and has categorized them generally as Hot Jupiters, Cold Gas Giants, Ocean Worlds & Ice Giants, Rocky Planets and Lava Worlds.
If you ignore the gas giants because there's no surface to land on, rocky planets (and maybe desert planets) would be extremely common. Water or ice planets would also be incredibly common. And, if you're really unlucky, you might end up on a lava planet -- one that's small and very close to its sun.
What wouldn't be common are things like an entire planet that's a swamp, or an entire planet that's a forest of Earth-style trees. I'm sure it's entirely possible that on some planet there's a life-form that becomes the dominant form and that looks vaguely like Earth-style trees, but not the kind you see on a typical SciFi show filmed near Vancouver.
Hey now. You can land on the surface of Jupiter if you're dense enough.
Metallic hydrogen sounds so cool.