Q: Is it likely that there are atoms in my body that have traveled from the other side of the planet, solar system, galaxy, or universe?
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Likewise, a fair fraction of the stuff you’re most likely to find drifting about in the solar system is water. Water seems like the most likely material to be from space and in your body. But that’s just water from our own solar system. It’s estimated that only about 0.01% of the dust in the solar system drifted in from interstellar space. There’s totally interstellar space water in you!