a) the iron core of a massive star which exploded as a type 1 supernova ORb) decay of nickel 56 and cobalt 56 in a supernova remnant.
First, the iron that we see all around us came from iron ore within the planet. Then in turn this iron came from a previos Sun before our Sun as it has been proven that our Sun is a 3rd generation star. a
There's no way to check a tranny on a bench. There's certainly no way to predict how long it would last.
90% of the time the best way to get a good one is to pull the dipstick and check the fluid. If it is red that is a good sign. If it is brown.pass on it! Some junk yards now days puts the mileage on the transmission. The lower the better!
A I have never even herd of Fe coming from decay of other elements.
A is correct. The process starts with the second largest stable nucleus created by silicon burning: calcium. One stable nucleus of calcium fuses with one helium nucleus, creating unstable titanium. Before the titanium decays, it can fuse with another helium nucleus, creating unstable chromium. Before the chromium decays, it can fuse with another helium nucleus, creating unstable iron. Before the iron decays, it can fuse with another helium nucleus, creating unstable nickel. The nickel then decays to unstable cobalt, which finally decays to stable iron-56. The iron can no longer be fused with other elements. As the star's core fills with iron, it begins to cool until there is no longer enough energy to maintain its size. It then collapses and the result is a supernova.
