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Bizarre new planet is largest known rocky world, 40 times as massive as Earth
(www.nationalgeographic.com)
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this post was submitted on 11 Jul 2023
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If there's life on that planet, they gonna have a hard time making it to orbit
I actually wonder what's the biggest (rocky) planet that is actually possible to launch a chemical rocket from. At some point you just can't get enough thrust to weight, right? They'd have to resort to exotic stuff like nuclear fission engines.
Sounds like a question to email Randall Monroe about.
Some people theorize that such a planet would actually be better for rocketry because they'd be forced to use significantly better propellant than chemical rockets, so, they'd start with nuclear rockets. If they got that far, anyway.
And since their planet is so much larger, it makes the vast irradiated zones created by failed launches easier to ignore!
I'm not an engineer or anything, but perhaps you could get a space elevator high enough to reach escape velocity more easily. Then again, it would have to be very tall I'm sure... Never mind probably not feasible.
For a geostationary orbit, which is where the center of mass of a space elevator would be:
h = ³√ G * m * T² / ( 4 * π² ) - r
So, if the mass goes way up, the height of the orbit will, too, unless something crazy happens like the planet spinning super fast.
I'm not a smart person, but my calculator says that a 200lb person would weigh 4 tons so I'm not totally sure there could even be multicellular life on that planet. Plus any atmosphere would probably be quite thicc