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It's almost 10% less. It's either a really weird coincidence or it says something interesting about planet formation that Earth, Venus, Saturn, Uranus, and Nep
by elihu 4y ago
It's almost 10% less. It's either a really weird coincidence or it says something interesting about planet formation that Earth, Venus, Saturn, Uranus, and Neptune all have almost the same gravity at the surface. (Of those five, Neptune has the highest gravity at 1.137g and Uranus is the least at 0.886g.)
- bee_rider 4y agoHuh, Mars is interestingly outside the norm there.
- ncmncm 4y agoIt is also unique, among those, in being wholly unable to sustain a buoyant aerial unshielded nuclear reactor. Titan can. But its surface gravity is less than a seventh of Earth's. It seems unlikely people can live on Titan or the Moon for long without fatal loss of skeletal tone. (Mars might be possible, but why bother?)
- elihu 4y agoI forgot to link the page with a big table of planets/moons and their gravities: https://en.wikipedia.org/wiki/Surface_gravity https://en.wikipedia.org/wiki/Surface_gravity Anyways, Mars is an outlier with respect to the "about 1G" crowd, but it's almost identical to Mercury. 0.379g vs 0.377g respectively. Jupiter is a true outlier at 2.528g.