Space and astronomy news
We know that interstellar objects occasionally visit our solar system. So far, we have only discovered two interstellar objects , but that’s mainly because we can only distinguish them from solar system bodies by their orbital motion, and that takes a series of observations over time. The two we have discovered, ?Oumuamua and Borisov, were only noticed because they had highly unusual orbits that moved through the inner solar system.
That is the question addressed in a new paper on the *arXiv*. It looks at how streams of interstellar bodies might escape a solar system and how they would then move through the Milky Way. While it is always possible for a random asteroid or comet to have a random flyby near a large planet that tosses it out of a system, most interstellar bodies would occur during the tumultuous early period of a star system when it is cleared of debris.
One final interesting aspect of these interstellar streams is their overall appearance. Several of the authors of this work are from Aotearoa New Zealand, and they noticed that the simulated patterns have a braided appearance similar to the braided rivers such as Rakaia on the South Island. So they named these interstellar streams he awa whiria, which means the braiding rivers in te reo M?ori, as an homage to that region and its people.
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