Timeline for How small can a planet be and still have Earth-like gravity?
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Feb 7, 2020 at 13:26 | comment | added | Tim | @user30007 not really, the difference between your head and feet is still only ~0.00001%. | |
| Feb 6, 2020 at 12:56 | comment | added | user30007 | On that osmium planet with the Earth's gravity and about a quarter its radius there would be quite a difference between the weight of your feet and the weight of your head, wouldn't it? | |
| Apr 21, 2015 at 9:03 | comment | added | userLTK | There's probobly not anything denser than Osmium in this context. Certainly there's denser material, even in our solar-system. The density at the core of our sun is about 150 g/CM3, but that's only possible under enormous pressure. The density of a white dwarf is much greater than that and the density of a neutron star, much greater still, but if you're talking about 1 earth gravity, neutron star material or white dwarf material would probobly be unstable and fly apart. There are some theories that say it could maintain integrity, but that's uncertain and I think unlikely | |
| Feb 21, 2015 at 16:04 | comment | added | user21 | Why would osmium be the limit though? Neutron stars are much denser. I realize you can't make a planet out of neutron star material, but surely there are things denser than osmium? | |
| Apr 30, 2014 at 15:23 | comment | added | zaratustra | Notably, despite having the same surface gravity of Earth, this "osmium-earth" has less than 0.1 times the mass. | |
| Apr 30, 2014 at 2:10 | comment | added | LDC3 | Yeah, that is small; that's half the size of Mercury. | |
| Apr 30, 2014 at 1:56 | comment | added | TheBluegrassMathematician | Wow that's really small on the planet scale. | |
| Apr 30, 2014 at 1:51 | history | answered | Gerald | CC BY-SA 3.0 |