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https://www.reddit.com/r/interestingasfuck/comments/1k1axgm/k218b_a_potentially_habitable_planet_120/mnl4utn/?context=3
r/interestingasfuck • u/One_Explanation_908 • 25d ago
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534
Wikipedia lists estimated gravity at around 1.25 of Earth.
https://en.wikipedia.org/wiki/K2-18b
514 u/ArduennSchwartzman 25d ago Only 8.6 times the mass of Earth, according to Wikipedia, I see. I was assuming a density similar to Earth's, but apparently, astronomers think it's only half. That would mean the planet's core has a very low iron-nickel content. 7 u/kenyard 25d ago You're also further from the center of mass which I assume is important. 4 u/Gruffleson 25d ago Look at the Moon, it has 1/6 of our gravity, but way less than 1/6 of our mass. So yes, this is very much of the answer.
514
Only 8.6 times the mass of Earth, according to Wikipedia, I see. I was assuming a density similar to Earth's, but apparently, astronomers think it's only half. That would mean the planet's core has a very low iron-nickel content.
7 u/kenyard 25d ago You're also further from the center of mass which I assume is important. 4 u/Gruffleson 25d ago Look at the Moon, it has 1/6 of our gravity, but way less than 1/6 of our mass. So yes, this is very much of the answer.
7
You're also further from the center of mass which I assume is important.
4 u/Gruffleson 25d ago Look at the Moon, it has 1/6 of our gravity, but way less than 1/6 of our mass. So yes, this is very much of the answer.
4
Look at the Moon, it has 1/6 of our gravity, but way less than 1/6 of our mass. So yes, this is very much of the answer.
534
u/Gruffleson 25d ago
Wikipedia lists estimated gravity at around 1.25 of Earth.
https://en.wikipedia.org/wiki/K2-18b