We're now pretty much 100% sure that 'Oumuamua was in fact a comet ejected from some other solar system.
Exposure to cosmic rays appears to have changed some of its ice into hydrogen gas, which was then released as it warmed up...and acted as a thruster.
It was just a regular, ordinary comet. And there have probably been others we just haven't noticed. Some of our system's comets may also end up getting ejected.
The interesting thing is that these comets could still potentially carry volatiles, including organic compounds, from system to system...
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