Why there are no time travelers.
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Whenever Earth reaches their orbit they fall down as shooting stars.
It would never reach it again because the solar system itself is moving and also the milky way
The interstellar space is not empty. They'll drop down somewhere eventually.
I'm not an expert, but if they are just drifting(without any self propulsion) I think they might ended up not hitting anything and just orbiting the center of the galaxy