AS.270.103 Lecture Notes - Lecture 2: Outer Core, Radioactive Decay, Peridotite

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Rate of expansion of universe has been subject to some uncertainty. H + h = he + heat. Implies more fusion reactions, beginning with lighter elements up to fe, the heaviest, at which point there is ignition. Nuclear fusion of light elements releases the energy that causes stars to shine, while that of heavy elements (absorbing energy) occurs in the extremely high-energy conditions of supernova explosions. I. e. whole core of earth is made of liquid and solid iron. Samples of meteorites are proof that all of this happened. More than 80% of meteorites are chondritic meteorites (look like ordinary rocks on. Achondrites don"t have chondrules in them and some come from mars (gives samples of other planets) Core is made of metal and the mg-silicate part of the mantle is made of chondrules, while pallasites are in the boundary between the core and mantle.

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