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Did iron in earth come from space?

Updated: 4/28/2022
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13y ago

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Ultimately, yes; every iron atom in existence, anywhere in the universe, was formed in the cataclysmic death of a supernova star. Some of the core of the star became a neutron star or black hole; the middle and outer layers of the star were blasted back into space. Every atom heavier than oxygen was produced in the same way.

Some of those iron atoms became part of the planetary nebula 6-7 billion years ago that later collapsed to form our solar system, including the Earth. So yes, the iron atoms in our cars and in our blood have passed through a supernova and come from space.

There may have been another planet in the early solar system, perhaps near to Earth. We believe that that other planet collided with the proto-Earth, and that the debris of the collision helped to form the Moon. The heavy iron-rich core of that planet probably sank to the center of the molten Earth and combined with the Earth's iron core; this may be one reason why the Earth is the densest planet overall, while the Moon is relatively much less dense.

The amount of iron that has fallen from space to the Earth since that time is probably relatively minor, but there are frequently iron meteorites. Legend says that Jim Bowie's famous "Bowie Knife" was made of meteoric iron.

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Q: Did iron in earth come from space?
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