Quote:
Originally Posted by oil pan 4
1 there's no way to know that and if earth and Mars are made if the same stuff then why did the radio isotopes decay faster on mars? That's not at all how nuclear decay works.
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1) We know what was present in the solar system's accretion disc at the time of each planets creation.
2) We know from orbital mechanics the mass of Mars.
3) We know what Mars is made of from it's mass and from pieces of Mars that have come to Earth as meteorites.
4) Space probes have been going to Mars and broadcasting data since 1972.
5) Mars is now surrounded be remote-sensing satellites.
6) Geologists know what the concentration and composition of radioactive elements were at the time of Mar's creation, and from their half-lives, how long they would have provided ample heat to maintain volcanism.
7) Earth is the only remaining planet in our solar system with enough radioactive heat generation in it's core to support magmatic volcanism.