1I/`Oumuamua and 2I/Borisov are the first macroscopic interstellar objects to be detected in the solar system. Their discovery has triggered a tsunami of scientific interest regarding the physical properties, dynamics and origin of the so-called interstellar interloper population. While it is clear that a deep understanding of these issues cannot be reached from a sample of just two bodies, the emergence of this new field of astronomical study is particularly fascinating, with ramifications from planetary science to galactic dynamics.
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