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Just look at the difference an active core makes by observing the difference between Earth and Mars. How likely is it that a planet has all the right things: li
by jstalin 14y ago
Just look at the difference an active core makes by observing the difference between Earth and Mars. How likely is it that a planet has all the right things: liquid water, enough gravity (mass), active core, planets further out sweeping up the debris so it doesn't destroy said planet over and over, tidally locked moon, etc.
My guess is that Earth is very, very unique.
- tokipin 14y agoyea but that doesn't mean that Earth's configurations are the only ones that yield life. example: the role water plays here on earth might not even be necessary in other chemical/physical systems, or could be played by other chemicals given different gravitational/atmospheric pressures, etc and i don't think there is anything about earth that is unsusual as far as planetary systems go